[relay-lsp] Additional automatic rename refactorings

[tobias-tengler]

Once https://github.com/facebook/relay/pull/4581 lands, the following opportunities for additional automatic renames have been identified and can be added one by one:

• Client schema extensions from their definition or usage in a selection set
• Relay Resolver fields from their usage in a selection set
• Relay Resolver field arguments from their definition or usage
• Types that are defined using resolvers