WIP: Replace llama.cpp with ollama

[cebtenzzre]

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Summary of changes as of 3/19

new directories:

• gpt4all-backend: an entirely new backend for GPT4All which includes a REST client for ollama.
• gpt4all-backend-test: a test for ollama client functionality written before the gpt4all-chat changes.

removed directories:

• gpt4all-bindings: there is no longer a llama.cpp backend for them to use. no plan for Embed4All users yet.

moved directories:

• gpt4all-backend -> gpt4all-backend-old: renaming this directory while we transition gpt4all-chat off of it.

new files:

• deps/CMakeLists.txt: cmake configuration for shared dependencies between gpt4all-chat and gpt4all-backend.
• gpt4all-backend/deps/CMakeLists.txt: cmake configuration for backend dependencies.
• gpt4all-backend/include/gpt4all-backend/formatters.h: fmt helpers split off from gpt4all-chat/utils.h.
• gpt4all-backend/include/gpt4all-backend/generation-params.h: obsolete; these are now defined in gpt4all-chat.
• gpt4all-backend/include/gpt4all-backend/json-helpers.h: helpers for (de-)serializing Qt types with Boost.JSON.
• gpt4all-backend/include/gpt4all-backend/ollama-client.h: a REST client for ollama.
• gpt4all-backend/include/gpt4all-backend/ollama-model.h: obsolete; this is now defined in gpt4all-chat.
• gpt4all-backend/include/gpt4all-backend/ollama-types.h: (de-)serializale types used in ollama client requests/responses.
• gpt4all-backend/include/gpt4all-backend/rest.h: helpers for working with REST APIs. used by ollama-client and gpt4all-chat.
• gpt4all-backend/src/CMakeLists.txt: cmake configuration for backend sources.
• gpt4all-backend/src/json-helpers.cpp: json-helpers.h implementation.
• gpt4all-backend/src/ollama-client.cpp: ollama-client.h implementation.
• gpt4all-backend/src/ollama-types.cpp: ollama-types.h implementation.
• gpt4all-backend/src/qt-json-stream.{cpp,h}: a QIODevice wrapping a boost::json::value, similar in concept to a std::ostringstream.
• gpt4all-backend/src/rest.cpp: implementation for rest.h.
• gpt4all-chat/qml/AddCustomProviderView.qml: a new tab of the "add model" page for adding new custom OpenAI or ollama providers.
• gpt4all-chat/qml/CustomProviderCard.qml: a card in AddCustomProviderView representing an ollama or OpenAI provider.
• gpt4all-chat/src/creatable.h: helper for classes derived from std::enable_shared_from_this.
• gpt4all-chat/src/json-helpers.cpp:
• gpt4all-chat/src/json-helpers.h: helpers for (de-)serializing Qt types with Boost.JSON which only gpt4all-chat needs.
• gpt4all-chat/src/llmodel_chat.{cpp,h}: base class for working with an LLM that can generate text.
• gpt4all-chat/src/llmodel_description.{cpp,h}: base class for working with the description of an ollama or OpenAI model.
• gpt4all-chat/src/llmodel_ollama.{cpp,h}: classes for working with ollama providers and models.
• gpt4all-chat/src/llmodel_openai.{cpp,h}: classes for working with OpenAI providers and models. derived from the obsolete chatllm.h.
• gpt4all-chat/src/llmodel_provider.{cpp,h,inl}: class for representing a model provider (type + name + base URL) which is either builtin or custom, and is serialized to the models directory if needed.
• gpt4all-chat/src/llmodel_provider_builtins.cpp: hardcoded, ordered list of built-in model providers, taken from qml.
• gpt4all-chat/src/main.h: exposes a singleton QNetworkAccessManager which should be used for all network requests on the main thread.
• gpt4all-chat/src/qmlfunctions.{cpp,h}: free functions needed by QML go here, since QML can only call instance methods.
• gpt4all-chat/src/qmlsharedptr.{cpp,h}: a basic shared pointer for QML. QSharedPointer has no built-in QML equivalent.
• gpt4all-chat/src/store_base.{cpp,h,inl}: base class for managing a collection of (de-)serialized objects (such as providers) using Boost.JSON.
• gpt4all-chat/src/store_provider.{cpp,h}: a class that manages a collection of (de-)serialized providers.
• requirements-docs.txt: defines the dependencies required to build the docs. extracted from the python bindings' pyproject.toml.

removed files:

• .github/ISSUE_TEMPLATE/bindings-bug.md: removed as the bindings are now gone.
• gpt4all-chat/src/chatapi.{cpp,h}: replaced by llmodel_openai.{cpp,h}.

changed files:

• .circleci/config.yml: removed references to the bindings.
• .circleci/continue_config.yml: removed references to the bindings.
• .codespellrc: updated whitelist.
• MAINTAINERS.md: removed references to the bindings.
• README.md: removed references to llama.cpp and the bindings.
• common/common.cmake: added color diagnostics for ninja.
• gpt4all-chat/CMakeLists.txt: modified lists of source files and dependencies.
• gpt4all-chat/deps/CMakeLists.txt: modified dependencies.
• gpt4all-chat/qml/AddModelView.qml: added custom providers tab.
• gpt4all-chat/qml/AddRemoteModelView.qml: replaced static providers with a dynamic list.
• gpt4all-chat/qml/ApplicationSettings.qml: removed llama.cpp-specific settings.
• gpt4all-chat/qml/ModelSettings.qml: removed llama.cpp-specific settings.
• gpt4all-chat/qml/RemoteModelCard.qml: remote providers now use the classes in gpt4all-chat.
• gpt4all-chat/src/chat.{cpp,h}: removed llama.cpp-specific state.
• gpt4all-chat/src/chatlistmodel.cpp: bumped .chat file version.
• gpt4all-chat/src/chatllm.{cpp,h}: partway through replacing llama.cpp use with ChatLLMInstance use.
• gpt4all-chat/src/chatmodel.h: replaced an #include since the referenced code moved.
• gpt4all-chat/src/database.cpp: replaced an #include since the referenced code moved.
• gpt4all-chat/src/embllm.cpp: partway through replacing llama.cpp-specific code.
• gpt4all-chat/src/jinja_helpers.cpp: unnecessary #include change.
• gpt4all-chat/src/main.cpp: added a global QNetworkAccessManager, and exposed the ProviderRegistry to QML.
• gpt4all-chat/src/modellist.{cpp,h}: moved out OpenAI-specific code and started integrating ModelDescription.
• gpt4all-chat/src/mysettings.{cpp,h}: removed llama.cpp-specific settings, added a hardcoded user agent, and started changing generation params.
• gpt4all-chat/src/network.cpp: removed llama.cpp-specific analytics.
• gpt4all-chat/src/server.{cpp,h}: started adapting to chatllm.{cpp,h} changes.
• gpt4all-chat/src/utils.{h,inl}: added more simple utilities.
• gpt4all-training/old-README.md: removed references to the bindings.

new deps:

• deps/qcoro: a library for building C++20 coroutines (async functions) using Qt's event loop.
• gpt4all-backend/deps/date: time zone aware date parsing required for parsing timestamps in ollama responses. will drop when all platforms support __cpp_lib_chrono >= 201907L.
• gpt4all-chat/deps/generator: third-party implementation of std::generator. will drop when all platforms support __cpp_lib_generator >= 202207L.

moved deps:

• gpt4all-chat/deps/fmt -> deps/fmt: fmt is now used by the backend as well.

changed deps:

• gpt4all-chat/deps/minja: changed to fix #include path of nlohmann/json.