Misc improvements for v1.1.0 (#1)

* Misc improvements for v1.1.0

- Bump Mediator.Abstractions from 3.0.1 to 3.0.2
- Add IRequestAuthorizationResultAccessor api for accessing the authorization metadata.
- Add support for registering request-builders and requirement-handlers via delegates.
- Add public api analyzer

Exclude icon requirement from package validation