Added support to set cache timeout in milliseconds#264

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onetocny wants to merge 5 commits intofilipw:devfrom

Commits on Dec 1, 2020

Added PreciseTime class to be able to specify precise caching timeouts using TimeSpan. Added new properties to CacheOutputAttribute to be able to specify timeouts by TimeSpan and used PreciseTime.
ondrej.netocny
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Commits on Dec 2, 2020

Added comments to new properties.
ondrej.netocny
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Fixed formatting.
onetocny
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Changed timeout property types from TimeSpan to string since TimeSpan cannot be passed as attribute property. Added client and server side tests.
onetocny
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Commits on Dec 8, 2020

Changed new properties into nullable ulong to handle precedence over existing properties.
ondrej.netocny
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