[issue40360] Deprecate lib2to3 (and 2to3) for future removal

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

It's typically not up to the core devs to pick a winning third party library; we tend to recommend libraries that are already essentially category winners, like requests. In a sense pointing to LibCST *and* parso is redundant because LibCST builds on parso. Comparing stars on GitHub:
- LibCST: 423
- parso: 296
- awpa: 10

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