Add C++ builder pattern

[JasonZhang517]

Corresponding to https://github.com/kvcache-ai/Mooncake/issues/978 Based on existing create method: static std::optional<std::shared_ptr<Client>> Create( const std::string& local_hostname, const std::string& metadata_connstring, const std::string& protocol, const std::optionalstd::string& device_names = std::nullopt, const std::string& master_server_entry = kDefaultMasterAddress, const std::shared_ptr<TransferEngine>& transfer_engine = nullptr);

Added builder functions with std::move to reduce copy.

[gemini-code-assist[bot]]

Summary of Changes

Hello @JasonZhang517, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a C++ builder pattern for the mooncake::Client class, enhancing the client creation process by offering a more structured, readable, and flexible API. The new MooncakeStoreBuilder allows for step-by-step configuration of client parameters, including validation for required fields, and optimizes string handling by leveraging std::move. This change aims to improve the maintainability and usability of client instantiation, moving away from a single, potentially complex Create method.

Highlights

• New Builder Pattern: Introduced a MooncakeStoreBuilder class to provide a fluent, type-safe, and more readable way to configure and create mooncake::Client instances.
• Parameter Handling: The builder methods (WithLocalHostname, WithMetadataConnectionString, etc.) utilize std::move for string parameters to reduce unnecessary copies during client configuration.
• Required Field Validation: The Build() method within MooncakeStoreBuilder now includes validation to ensure essential parameters like local_hostname and metadata_connstring are provided before attempting to create a Client.
• Deprecation Notice: The existing PyClient::setup method has been marked as deprecated, encouraging future use of the new MooncakeStoreBuilder for client initialization.
• Internal Refactoring: The internal PyClient::setup_internal method has been updated to use the new MooncakeStoreBuilder for constructing Client objects, demonstrating its intended usage.

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[stmatengss]

Use clang-format to fix code format issue.