[QUIC] Optimize stream reads

[scalablecory]

The way we are implementing stream reads means we will often have more async/await overhead than is needed.

Instead of having an internal resettable task that we always await inside of ReadAsync, we should return a resettable task and have the MsQuic callback manage completing it. This will allow us to avoid an async state machine in ReadAsync().

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[scalablecory]

Implementing this as part of #756

[ManickaP]

@CarnaViire was this fixed with your PR which scavenged Cory's PR? Can you close this in case of a YES, please?

[CarnaViire]

Yes, this was done in #55505