[Proposal] use Timer in MemoryCache#45842

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adamsitnik wants to merge 8 commits intodotnet:masterfrom

adamsitnik:memoryCacheTimer

Commits on Dec 4, 2020

don't get current time and check if scan for expired items should be performed, use Timer instead
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remove duplicated code from tests
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update tests: background activity is not required anymore
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update tests: don't use the default expirationScanFrequency as these two tests would need to wait for a minute to get result (CI would not like it)
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introduce CanExpire flag
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don't ask for current time if the entry that has been found can not be expired (TechEmpower case)
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based on profiling apply or revert some micro optimizations
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Commits on Dec 9, 2020

Merge remote-tracking branch 'upstream/master' into memoryCacheTimer
adamsitnik
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