bug: allow explicit hidden file paths in `--reload-include`

[michaeloliverx]

Summary

Relates to https://github.com/encode/uvicorn/issues/2166

Checklist

• [x] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.

[adambenali]

@michaeloliverx does this work for glob patterns? e.g. --reload-include '.env*'