Fix: Added AsyncListener to handle completion, timeout, and error eve…

[liruixin]

…nts for AsyncContext.

when the mcp client closed，the server side will close the session with this commit

Motivation and Context

it cause the memory leak.

How Has This Been Tested?

yes，i have tested this commit in the real production env，when the client closed，the server side would be nerver close the session

Breaking Changes

yes, they need to update code

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context