Add documentation for get_access_token() dependency function (#1446)

fixes #1398: Add JWT claims to AccessToken (#1399)

Refactor `get_http_request` and `context.session_id` (#1242)

Add accept to excluded headers

Add basic bearer auth for server and client

Update src/fastmcp/server/dependencies.py

Ensure behavior-affecting headers are excluded

Update dependencies.py

Ensure content-length is always stripped from client headers

Refactor context to avoid unecessary passing