* create OCI required files
* request and response conversion for non-streaming chat
* support tool calling with OCI generic API without streaming
* adaptation of api call for generic and cohere format
* include tool calls and responses in generic api and dropping support for cohere
* fix invalid content-length error
* support streaming for generic api
* fix auth error when using acompletion with streaming
* refactor: use base_llm_http_handler and include API type definitions
* update types and add type safety in different methods
* fix OCIFunction format
* create custom stream wrapper for decoding OCI stream
* remove unused files
* create unit tests for OCI
* lint the code
* remove manual test
* docs: update the docs to include OCI
