Investigate adding the Python Buffer Protocol on the memory

[thewtex]

If possible, this would help with efficient use of memory and provide a convenient developer interface.

The Python Buffer Protocol enables creating, e.g. NumPy array views on the memory with np.frombuffer.

xref #81

[thewtex]

Done per:

wasmtime-py/wasmtime/_memory.py

Lines 73 to 75 in e655f68

	np_mem = np.frombuffer(memory.get_buffer_ptr(store), dtype=np.uint8)
	np_mem[start:end] = A # write
	B = np_mem[start:end] # read

thanks to refactoring by @muayyad-alsadi 🎉 !