* chore: More complete tracing for RBAC functions
* Add input.json as example rbac input for rego cli
The input.json is required to play with the rego cli and debug
the policy without golang. It is good to have an example to run
the commands in the readme.md
* Add span events to capture authorize and prepared results
* chore: Add prometheus metrics to rbac authorizer
This PR adds an RBAC package for managing using permissions:
- The top-level `authz.Authorize` function is the main user-facing entrypoint to the package.
- Actual permission evaluation is handled in `policy.rego`.
- Unit tests for `authz.Authorize` are in `authz_test.go`
- Documentation for the package is in `README.md`.
Co-authored-by: Cian Johnston <cian@coder.com>
