v0.9.0.rc0

New features:

• Include kafka-python into aiokafka's code base
• Replace python-snappy and zstandard with cramjam
• PEP518 compliant pyproject.toml
• Python 3.12 support

Bugfixes:

• Fix type annotation for ConsumerRecord (pr #912 by @zschumacher)

Improved Documentation:

• Fix AbstractTokenProvider.token example (pr #919 by @mtomilov)