Add JWKFetcher::getFormatted() method and switch validator to use

[joshcanhelp]

Changes

• Add JWKFetcher::getFormatted() method to pull entire JWKS instead of specific keys. This makes for more clear caching and allows us to deprecate several unnecessary methods in this class.
• Refactor the MockApi class used in test suites to allow new mocked API responses to be added more easily.

Testing

• This change adds test coverage
• This change has been developed on PHP 7.1

[stevehobbsdev]

LGTM! Just had more of a question around the getFormatted naming but didn't want to hold up the PR.

[stevehobbsdev]

Just a bit confused by the name. What does it mean to format the JWKS for JWT::decode()?

The naming points to an internal transform process, just wondering if the developer needs to understand that detail. Could this be called getKeysFromJwks or something similar?

[joshcanhelp]

JWT::decode() is an external library that validates JWT signatures (and a few other things). It takes public key signatures in the form of $keys[$kid] = $x5c_pem.

Good point about the method name, that is a little vague. I don't think we need to say "from JWKS" since we're in the JWKS class but I'll rename.

[github-actions]

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