WIP Python 3.14 attempts

[hroncok]

This is not ready yet. I decided to open it in case somebody wants to follow up.

[entelligence-ai-reviews]

Walkthrough

This PR improves compatibility and robustness of uvloop with various Python versions by updating imports and attribute access patterns. It introduces defensive coding techniques to handle changes in the Python standard library, ensuring uvloop continues to function correctly even if certain classes or attributes are renamed, moved, or missing in different Python releases.

Changes

File(s)	Summary
uvloop/init.py	Updated import of BaseDefaultEventLoopPolicy from asyncio.events to use a try-except block, falling back to _BaseDefaultEventLoopPolicy if the standard import fails, for compatibility with Python version changes.
uvloop/includes/stdlib.pxi	Modified assignment of 'aio_AbstractChildWatcher' to use getattr for retrieving 'AbstractChildWatcher' from the asyncio module, with object() as a fallback if the attribute is missing, improving robustness against missing attributes.

Sequence Diagram

This diagram shows the interactions between components:

sequenceDiagram
    title Import Flow for BaseDefaultEventLoopPolicy

    participant App as "Application Code"
    participant ImportSystem as "Python Import System"
    participant AsyncioEvents as "asyncio.events Module"
    participant UvloopModule as "uvloop Module"

    App->>UvloopModule: Import uvloop
    activate UvloopModule
    
    UvloopModule->>ImportSystem: Import BaseDefaultEventLoopPolicy
    activate ImportSystem
    
    alt Primary import path
        ImportSystem->>AsyncioEvents: Try: from asyncio.events import BaseDefaultEventLoopPolicy
        AsyncioEvents-->>ImportSystem: Successfully imported
        ImportSystem-->>UvloopModule: Return BaseDefaultEventLoopPolicy
    else ImportError occurs
        ImportSystem->>AsyncioEvents: Exception: ImportError
        Note over ImportSystem,AsyncioEvents: Issue #131148 in CPython
        ImportSystem->>AsyncioEvents: Try: from asyncio.events import _BaseDefaultEventLoopPolicy
        AsyncioEvents-->>ImportSystem: Successfully imported fallback
        ImportSystem-->>UvloopModule: Return _BaseDefaultEventLoopPolicy as __BasePolicy
    end
    
    deactivate ImportSystem
    
    UvloopModule->>UvloopModule: Continue with other imports
    Note over UvloopModule: Import Loop from .loop
    
    UvloopModule-->>App: uvloop successfully imported
    deactivate UvloopModule

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