gh-75223: Deprecate undotted extensions in mimetypes.MimeTypes.add_type
#128638
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Extensions that don't start with a dot will never be found by methods/functions that act on the registry, so we should stop users from mistakenly adding them. The one exception is the empty string extension. This could be in use to detect absent extensions, so instead of raising a ValueError we emit a warning.
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As suggested by @encukou at #2895 (comment), we should deprecate this before raising a backwards-incompatible
ValueError.This PR is the first step to add a deprecation warning.
📚 Documentation preview 📚: https://cpython-previews--128638.org.readthedocs.build/