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GH-32240: [C#] Support decompression when reading an IPC stream from ReadOnlyMemory (#34108)

This is a small follow-up to #33603 to support reading a compressed IPC stream from a `ReadOnlyMemory<byte>`, as I missed that this has a separate reader implementation.
* Closes: #32240

Authored-by: Adam Reeve <adreeve@gmail.com>
Signed-off-by: Weston Pace <weston.pace@gmail.com>