* Improve deserialization performance around validation and its tests
The claims validation was done via deserializing into a Map, which
implies allocations/deallocations. This was done even if the map was not
used afterwards.
This commit improves performance of the validation by never
deserializing in a `Map`, and deserializing only when necessary, to
a struct that typically only borrows from the original b64-decoded
json string.
The validation function interface change required update to the tests,
which are also made easier to read by using the `serde_json::json!`
macro.
* unrelated: fix bench compilation
* Bump minimum required Rust version to 1.40
Motivation for this change is use of `#[non_exhaustive]` attribute that
was stabilized in Rust 1.40.0
* Migrate benchmarks to criterion
Remove use of unstable features in favour of criterion benchmarks
* Enable clippy in Github Actions
* Fix clippy::manual_non_exhaustive
Remove manual implementations of the non-exhaustive pattern. Instead
use the `#[non_exhaustive]` attribute.
* Allow reexport of deprecated function
Silence rustc `deprecated` working in function reexport
* Remove redundant clone
* Fix various clippy warnings
* Remove redundant pattern
* Use `unreachable!()` to fail test
* No need to add `&` to all patterns
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