Keep track of pending Redis get calls in client side caching to avoid race with invalidations. #3481

[IvarHenckel]

Closes #3481

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[IvarHenckel]

So far didn't add any tests. I felt I was only changing internal parts and there is already tests against the end behavior. Testing the race itself, i.e. somehow mocking the order of threads, is tricky. But let me know if you prefer more tests.