* feat: add actix feature flag
* (WIP)feat: add axum feature
* WIP: axum veridy digest + example
Note: this does not compile yet
* WIP
* chore: clippy lints
* Use actix rt for axum example
* ci: run example in CI for both actix and axum
* feat: add json wrapper type for axum
* docs: update readme with actix and axum feature flags
* fix: fix ci
* chore: more clippy lints
* refactor: update according to PR comment and factorize 'verify_digest'
