asyncio performance improvements for 3.15

[kumaraditya303]

Issue for tracking performance improvements I plan to work on for 3.15.

• build _asyncio as static module for faster tls access build _asyncio module as static module #136669
• add fastpath for current running loop in asyncio.all_tasks under free-threading gh-140414: add fastpath for current running loop in asyncio.all_tasks #140542

Linked PRs

• gh-140414: add fastpath for current running loop in asyncio.all_tasks #140542