detailed_metric support for dynamic config using xDS server

[akondapuram]

Hi all, we have a scenario where we would like to have the detailed_metric support for the dynamic config as well.
The open source solution using static limits supports a feature called detailed_metric in the descriptor of the ratelimit config for extending the metrics for unspecified values. However, the dynamic config using xDS Server (xds-config) doesn't support this field. This is the RatelimitConfig proto it uses.

Could we please add the detailed_metric field to dynamic config as well? Thank you!

[akondapuram]

Created 2 PRs

1. For the go-control-plane repo. This has to be checked in first as the second PR has a dependency on this one.
2. For the ratelimit repo.

[akondapuram]

The change has been merged. Thanks!