Add bufcheck support for remote policies #3934
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This PR adds support to bufcheck.Clients to invoke remote Policies with remote Plugins. Remote Policies are pulled from a registry and stored locally in the buf cache. Remote plugins are supported for both Local and Remote Policies. These are resolved through the policy's plugin providers (see the buf.lock file changes).
Invoking a remote policy will show the PolicyRef, and the PluginRef if a custom plugin, per each lint annotation. For example with a remote policy that enforces a custom plugin:
Policies that invoke just a built-in rule do not have a plugin reference
(buf.build/acme/buf-policy-suffix:v1)