Add some generic type hook wrappers to first decode the data
There seems to be a pattern for Validation, Mutation and Write Authorization hooks where they first need to decode the Any data before doing the domain specific work.
This PR introduces 3 new functions to generate wrappers around the other hooks to pre-decode the data into a DecodedResource and pass that in instead of the original pbresource.Resource.
This PR also updates the various catalog data types to use the new hook generators.
This change adds ACL hooks to the remaining catalog and mesh resources, excluding any computed ones. Those will for now continue using the default operator:x permissions.
It refactors a lot of the common testing functions so that they can be re-used between resources.
There are also some types that we don't yet support (e.g. virtual IPs) that this change adds ACL hooks to for future-proofing.
Fix issues with empty sources
* Validate that each permission on traffic permissions resources has at least one source.
* Don't construct RBAC policies when there aren't any principals. This resulted in Envoy rejecting xDS updates with a validation error.
```
error=
| rpc error: code = Internal desc = Error adding/updating listener(s) public_listener: Proto constraint validation failed (RBACValidationError.Rules: embedded message failed validation | caused by RBACValidationError.Policies[consul-intentions-layer4-1]: embedded message failed validation | caused by PolicyValidationError.Principals: value must contain at least 1 item(s)): rules {
```
Matt Keeler