Consider using zstd from stdlib for Python >= 3.14

[sk-]

Describe the solution you'd like
Currently aiokafka requires the third party dependency cramjam for zstd support. However, since Python 3.14 the stdlib has the module compression.zstd (https://docs.python.org/3/library/compression.zstd.html).

Additional context
The change to support this should be minimal as the stdlib API is similar to cramjam's.