KIP-565 — Using AclCommand,avoid call the global method loadcache in SimpleAclAuthorizer

Accepted SecurityAdmin

Fixes `AclCommand` (the `kafka-acls.sh` CLI) to avoid invoking `SimpleAclAuthorizer.loadCache()` when not strictly necessary for the requested operation (e.g., add/delete ACL). On clusters with 20,000+ topics, `loadCache()` reads all ACL znodes from ZooKeeper into memory, turning a simple ACL mutation into a minutes-long operation.

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