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Several typing improvments:

1. msgspec.msgpack.Enc now accepts all buffers, not just bytes | memoryview | bytearray. I've added a runtime test to proove that
2. Renamed T and other typing-only utils to be protected names: T and _enc_hook_sig can't be imported from msgspec.msgpack in runtime

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Same things seem to apply to json.pyi. Do you wanna add that to this PR?

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I would prefer to analyze all modules one by one, there are multiple type errors there as well :)