Add stream conformance tests for standalone streams #44069
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src/libraries/Common/tests/Tests/System/IO/StreamConformanceTests.cs
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I previously added a stream test suite for streams that could be created in a connected fashion, such that writing to one stream yields data that can be read by another. That enabled testing of a bunch of streams like NetworkStream, SslStream, BufferedStream, etc., even FileStream when wrapped around a pipe.
This PR augments the suite for standalone streams that aren't connected in that fashion. This includes MemoryStream, FileStream for on-disk files, UnmanagedMemoryStream, MemoryMappedViewStream, etc. As with the previous PR, even though it's adding a lot of coverage, total line count is reduced, because it's consolidating tests that were unique to an individual test suite.
I also added a couple of tests to the existing connected suite.
cc: @geoffkizer, @carlossanlop, @jozkee