[NET-3092] JWT Verify claims handling

[roncodingenthusiast]

Description

• This PR first changes how we write the payload key in the jwt_authn filters. The payload key is based on the path and provider name to eliminate any cross provider/path claims validation
• Then subsequently we get that payload name and write it on rbac policies for claims validation during http requests

background info

• For claim verification, we need to write the claims to validate in the RBAC policies. Example in envoy, specifying payload_in_metadata allows us to write data from the JWT payload to StreamInfo DynamicMetadata (read more here)

• Example of what the payload will look like: option 1 in this gist https://gist.github.com/pglass/a83603b77c1497b76490abc7afd44298

• The test data file contain what the envoy config will look like with the jwt token

potential todo

• maybe add more tests for utility functions?