ldap: allow using a cache for authentication and authorization

[dikshant]

We currently have a cache that is used for authentication. We should extend this to also work with LDAP authentication.

We currently have a cache that is used for authentication. We should extend this to also work with LDAP authentication. Since the current cache only caches role options, we should investigate extending this cache or adding another cache for authorization. We should also have settings to control the cache TTL eg:

SET CLUSTER SETTING server.authentication_cache.time_to_live= '10m'
SET CLUSTER SETTING server.authorization_cache.time_to_live = '10m';

Jira issue: CRDB-39236

Epic CRDB-33829