PEP 700: Mark as Final

[hugovk]

• Final implementation has been merged (including tests and docs)
• PEP matches the final implementation
• Any substantial changes since the accepted version approved by the SC/PEP delegate
• Pull request title in appropriate format (PEP 123: Mark Final)
• Status changed to Final (and Python-Version is correct)
• Canonical docs/spec linked with a canonical-doc directive
  (or canonical-pypa-spec for packaging PEPs,
  or canonical-typing-spec for typing PEPs)

Helps #2872.

The new size and upload-time fields have been documented in the spec:

• https://packaging.python.org/en/latest/specifications/simple-repository-api/#additional-file-information

And have been implemented at least in:

• PyPI: Add support for PEP 700 pypi/warehouse#12727
• Bandersnatch: Add in PEP700 simple API v1.1 support pypa/bandersnatch#1557
• pypi-simple: Add upload time to package info jwodder/pypi-simple#5
• Mousebender: Add support for PEP 700 brettcannon/mousebender#93

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📚 Documentation preview 📚: https://pep-previews--3643.org.readthedocs.build/pep-0700/

[pfmoore]

Probably needs approval from @dstufft too, as the PEP delegate.

[hugovk]

I think this can be merged and 6 weeks is long enough, I'll merge tomorrow if no-one objects.