* feat(op): user slog for logging
integrate with golang.org/x/exp/slog for logging.
provide a middleware for request scoped logging.
BREAKING CHANGES:
1. OpenIDProvider and sub-interfaces get a Logger()
method to return the configured logger;
2. AuthRequestError now takes the complete Authorizer,
instead of only the encoder. So that it may use its Logger() method.
3. RequestError now takes a Logger as argument.
* use zitadel/logging
* finish op and testing
without middleware for now
* minimum go version 1.19
* update go mod
* log value testing only on go 1.20 or later
* finish the RP and example
* ping logging release
* feat: get issuer from context for device auth
* use distinct UserFormURL and UserFormPath
- Properly deprecate UserFormURL and default to old behaviour,
to prevent breaking change.
- Refactor unit tests to test both cases.
* update example
