As part of an effort to define a more stable sql interface for the introspection of cockroach specific internals, we're increasing the operator overhead for accessing the crdb_internal and system catalogs. This should make it clear that this catalog is not designed for stable usage, and encourage customers to request production-grade interfaces for the tables defined within it.

So that we can prevent unsafe access to the crdb_internal schema, we'll begin gating access to the builtins within it.

Epic: CRDB-24527

Jira issue: CRDB-53314