cache: add Close to stop the janitor - #195
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The janitor goroutine is only stopped from a finalizer, so caches with a cleanup interval never exit under testing/synctest (and callers have no way to stop it themselves).
Close() stops the janitor without waiting for GC. Safe to call more than once, including when no janitor was started. The stop channel is closed once so a later finalizer cannot block.
Fixes #185