pydantic_core 2.0.0 on Python PyPI

What's Changed

move pydantic_core -> python/pydantic_core by @davidhewitt in #705
small cleanups after move to python/ source dir by @davidhewitt in #708
run stubtest on _pydantic_core.pyi by @davidhewitt in #702
Add EitherFloat by @JeanArhancet in #691
fix stubtest issue post-merge by @davidhewitt in #711
Use from __future__ import annotations instead of string type hints in python/pydantic_core/_pydantic_core.pyi by @adriangb in #710
Fix installation with pypy3.7 and pypy3.8 by @adriangb in #716
PYD-137: Implement PydanticUseDefault error by @adriangb in #714
Add faster int inequality by @JeanArhancet in #694
PYD-147 Better model error messages by @samuelcolvin in #719
prepare to release v2.0.0 by @samuelcolvin in #720

Full Changelog: v0.42.0...v2.0.0