Keep tracking the file offset in memory, don't perform expensive Seek calls on every Read|WriteAsync - #49145

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adamsitnik wants to merge 20 commits into

dotnet:mainfrom

adamsitnik:noExtraSeekCalls

Commits on Feb 25, 2021

Commits on Mar 1, 2021

Commits on Mar 3, 2021

0 bytes reads are OK only for FileStream when the read buffer is empty
adamsitnik
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simplify the source code by removing some of the optimizations that are not providing too much gains
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Commits on Mar 4, 2021

Commits on Mar 5, 2021

there is no need to set the Length since we are now tracking the offset in memory
adamsitnik
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