Exclude Python Files Generated by Protocol Buffers from Language Statistics

### Problem:

Linguist currently counts `Python` files generated by `Protocol Buffers` as regular `Python` code. These `machine-generated` files should be `excluded` from language statistics.

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### Example:

Typical patterns for generated `Python` files:
- `*_pb2.py`
- `*_pb2.pyi`
- `*_pb2_grpc.py`

Example project: [pplmx/pb](https://github.com/pplmx/pb)

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### Expected Behavior:

Linguist should detect and skip `Python` files generated by `Protocol Buffers` based on their naming patterns.

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### Reference:

Documentation for generated Python files: [Protocol Buffers Python Generated Code](https://protobuf.dev/reference/python/python-generated/)

Thank you!