Support for buffers in load_bytes() factory

[lexplua]

This PR addresses Bloom load_bytes support for all objects with buffer protocol implemented.
The problem I was trying to solve was:

• Bloom filter creation in the main process
• Passing existing filter to worker processes via Python SharedMemory
  The SharedMemory instance has .buf member, which is memoryview instance. Current Bloom implementation can work only with bytes to load serialized filter object. It leads to additional memory copy (in addition to one inside load method.

After this PR Bloom filter can be constructed from any object with buffer protocol support, such as memoryview, array, bytearray, numpy array (I guess)

On a side note it bumps Python ABI compatibility requirements to 3.11. From Pyo3 documentation about PyBuffer:

Available on non-Py_LIMITED_API or Py_3_11 only