Add support for retrieve catalog nodes

[giladwolff]

What problem are we solving?

Currently there is no support for the Consul List-Nodes HTTP API.

How are we solving the problem?

Added a get_nodes API that accepts a GetNodesRequest and returns a GetNodesResponse with a vector of CatalogNodes. The api is based on the Consul HTTP API with a few changes:

• We don't expose the deprecated NodeMeta option, and force clients to use the new filter Meta selector.
• We don't expose partition, as it is only available in the enterprise edition and can be deduced by the ACL.

As part of this change I added a test and to make it easier to test locally I made all tests clean after themselves so that as long as there is no intermediate failures tests can be run again and again.

Checks

Please check these off before promoting the pull request to non-draft status.

• All CI checks are green.
• I have reviewed the proposed changes myself.

[github-actions]

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[giladwolff]

I have read the CLA Document and I hereby sign the CLA