JwkUtils::compute_digest must not fail #480
Description
The compute_digest method currently does not return a Result<>, and thus is not allowed to error. This is not a problem for the built in providers, however third party ones may need to throw an error, and must currently unwrap. This function should be changed to return a Result.
The Algorithm enum should also be made #[non_exhaustive], so that when algorithms are added in the future, third party providers continue to compile (and can panic via unimplemented!() instead).
Both changes are breaking.