New creates an instance of Cache.

Cache stores clients keyed by profile name and leaf cluster name.

Config describes the client cache configuration.

NoCache is a client cache implementation that returns a new client on each call to Get.

NewClientFunc is a function that will return a new [*client.TeleportClient] for a given profile and leaf cluster.

RetryWithReloginFunc is a function that should call [fn], and if it fails with an error that may be resolved with a cluster relogin, attempts the relogin and calls [fn] again if the relogin is successful.