Add controller.expireAll() that sets all responses to *STALE* #2738
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Fixes #1548
Motivation
Similar to use case of invalidateAll(), but does not result in loading condition.
Solution
Add controller.expireAll() that sets all responses to STALE
This is like controller.invalidateAll(); but will continue showing
stale data while it is refetched.
This is sometimes useful to trigger refresh of only data presently shown
when there are many parameterizations in cache.