[ice-pring]

quality() and best_match() split Accept lists at every comma, including commas inside quoted parameter values. For example, this valid media range raises MimeTypeParseException:

media_type = 'text/plain;profile="a,b"'
mimeparse.best_match([media_type], media_type)

Split list members while tracking quoted strings and backslash escapes, as specified in RFC 9110 section 5.6.4. Preserve the original strings for parameter parsing. The common unquoted case continues to use str.split().

Added shared JSON cases for quality selection and tests covering quoted commas, escaped quotes, escaped backslashes, semicolons within quoted values, and blank list members.

Validation on Windows:

• The added regressions produce 9 errors before the fix and pass afterward.
• python mimeparse_test.py passes.
• Tox py312 and py314 each pass all 6 test methods, including the shared JSON cases, on CPython 3.12.14 and 3.14.5.
• Tox flake8 and git diff --check pass.