Fix: RequestTask can't close correctly if task thread end without put an eof into queue
Fix: LLM Instrument can't trace token usage correctly in streaming mode
Fix: function 'get_invocation_chain' returns None in some case
Fix: Wrong logic while adding raw token usage dict
Fix: Sls sink use async func to process log
ADD: MCPManager add an async func 'safe_close_stack_async' to close all session in asyncio env
ADD: add sls base sink
