Function Calling features

[csterwa]

Group 1

• Design
  Refactor FunctionCallbackContext to FuctionCallBackResolver interface #758 -> refactor: introduce FunctionCallbackResolver interface #1804
  Inconsistency in API Method Implementation in OpenAi Chat Model #869
  Support asynchronous/reactive function calling #1778
  Support for declarative build function callbacks in the Spring container #1105
  Concurrent Function/Tool Invocation #941
  [WIP] Add possibility to register functions in a type-safe manner #787

• Return tool calling information in ChatResponse
  Allow Tool Calls in Response #1177
  Function Call Response Is Not Inside ChatResponse Object #368

• Fine-grained control over function invocation. Related issues,
  Spring AI should allow function calling to be proxied for a remove invocation by OpenAI clients #1367
  Enhance the expansibility of function call #1032
  [FEATURE] avoid second round trip for function call #656,
  Avoid second roundtrip when call functions #652,

• Customize invocation within function calling. Related issues,
  Add support for passing a FunctionCallbackWrapper when registering functions via ChatClientRequestSpec #1303,

• Exposing function context by supplying history, security, user info, etc... Related issues,
  Possibility to connect function calls with messages they are related to #1202,
  Pass context information to Function Call Thread #991,
  Support for Passing Contextual Parameters in Function Calling #864

• Support more types in function calling. Related issues,
  Build a function call without input parameter in spring AI #860,
  The function definition for function calls does not support generics. #1118,
  Support for registering Supplier functions in addition to Function interfaces for LLM function calling #1277

• Review if issue is resolved. Related issues, Function calling - FunctionCallingOptions doesn't work with OpenAiChatClient/AzureOpenAiChatClient #624

Group 2

• Annotation based function definition. Related issues,
  Support function calling for reflection Method with multiple arguments #1099
  Feature Request: Support for Invoking HTTP-based APIs via OpenAPI Spec #806
• Kotlin support. Related issues
  Function Calling with Kotlin Functions #922
  Add support for Kotlin functions #1666
  Add Kotlin reflection support to ModelOptionsUtils #1667
• Additional model support for function calling. Related issues, Question about ollama + qwen #992