PEP 681: Add Post-History

[JelleZijlstra]

Links to three typing-sig threads:

• https://mail.python.org/archives/list/typing-sig@python.org/thread/TXL5LEHYX5ZJAZPZ7YHZU7MVFXMVUVWL/#TXL5LEHYX5ZJAZPZ7YHZU7MVFXMVUVWL (Eric Traut's original proposal, which evolved into the PEP)
• https://mail.python.org/archives/list/typing-sig@python.org/thread/EAALIHA3XEDFDNG2NRXTI3ERFPAD65Z4/#S7XYHYXK4NQDVWARMTUP74MAUWPXQCNN (formal thread on the PEP)
• https://mail.python.org/archives/list/typing-sig@python.org/thread/BW6CB6URC4BCN54QSG2STINU2M7V4TQQ/#BW6CB6URC4BCN54QSG2STINU2M7V4TQQ (detailed discussion on descriptor behavior)

I omitted a link to https://discuss.python.org/t/rfc-on-pep-681-data-class-transforms/14116/2 which doesn't have much useful discussion.

Other relevant links:

• Support for libraries with dataclass semantics microsoft/pyright#1782 (initial pyright discussion)
• dataclass transforms, propose ability for an indirection layer for SQLAlchemy microsoft/pyright#2958 (detailed discussion of SQLAlchemy behavior)

cc @debonte