Add resolver metadata field and ability to update metadata

[ryanchristo]

Summary

A resolver currently has three properties, id, manager, and url. A resolver manager may want to store additional information about the resolver such as a resolver name, description, and/or instructions on using the resolver.

Problem Definition

A resolver manager may want to provide additional information about a resolver.

Proposal

Add a metadata field and UpdateResolverMetadata proto message, implement the message, and add a CLI command.

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