EPIC - Removing deprecated code

[markpollack]

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The next release is RC1 which will not have any @Deprecated code. There is not another M8 to allow users one more release cycle to upgrade. So some changes such as

https://github.com/spring-projects/spring-ai/commit/1f59ccadad13f007f07a2389edc33923b6d710ea

wrt to Advisors will be breaking changes. This needs to be clearly communicate in upgrade-notes.adoc

This is the fine grained list of what deprecated code needs to be removed.

Large Effort

• [ ] CallAroundAdvisor needs to be removed and code updated. So does usage of AdvisedRequest, AdvisedResponse - > use ChatClientRequest and ChatClientResponse [Post M8]

Medium Effort

• [ ] Ctors for UserMessage (To discuss: should we add builder for other Message implementations?) [Post M8]
• [ ] All the classes in the model.function package. This requires minimax and potentially zhipu refactoring. [In M8]
• [ ] OpenAiApi - ChatCompletionRequest - check about useage of max_tokens, other OpenAI API compatibly libraries may still use it. [In M8]
• [ ] https://github.com/spring-projects/spring-ai/issues/2518 [In M8]

Low Effort

• [x] ContentFormatter was listed as deprecated, but we are going to keep it.
• [ ] ChatModelObservationContext - remove getRequestOptions [In M8] #2518
• [ ] Same as above for Embedding and Image modelobservationcontext. [In M8] #2518
• [ ] ToolCallback [In M8]
• [x] AnthropicApi - left over 'with' Builder methods.
• [x] VertexAiGeminiChatOptions - some simple left over methods.
• [x] Deprecated test methods in ITs, e.g. BedrockProxyChatModelIT - need to make sure there are equivalents in the updated API.
• [x] SimpleVectorStoreContent

Update examples in our exmaples repo.

• [ ] Move to snapshot and rebuilt the examples.