gh-130328: Faster Windows new REPL paste

[devdanzin]

This WIP PR attempts to make pasting into the Windows REPL faster by:

• Batching event processing;
• Reading 32 chars from input instead of 1;
• Reducing Reader.console.wait() from 100 to 10.

It's being submitted to simplify testing the approach and will be improved based on feedback.
Current code makes some tests fail, I'll fix those soon.

• Issue: Pasting in new REPL is slow #130328

[python-cla-bot]

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