rfc7636: validate code challenge format #638
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[Section 4.2 of RFC 7636](https://datatracker.ietf.org/doc/html/rfc7636#section-4.2) mentions the ABNF form to which the code challenge should adhere. authlib currently accepts any string in code_challenge without validating if it matches the format specified in the RFC. Fix the same and also update relevant tests.
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Section 4.2 of RFC 7636 mentions the ABNF form to which the code challenge should adhere. authlib currently accepts any string in code_challenge without validating if it matches the format specified in the RFC. Fix the same and also update relevant tests.
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