Update Schannel Logic to Handler Larger Output Buffers

[nibanks]

Description

A user reported an issue with the schannel variant of MsQuic sometimes not working, and it was an issue with too large of output buffers. This change updates the code to dynamically increase the buffer size as necessary.

Note - We might want to backport this.

Testing

Updated a test to exercise the new code paths.

Documentation

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4778465) 87.25% compared to head (953811a) 87.15%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4083      +/-   ##
==========================================
- Coverage   87.25%   87.15%   -0.11%     
==========================================
  Files          56       56              
  Lines       16938    16983      +45     
==========================================
+ Hits        14780    14801      +21     
- Misses       2158     2182      +24     

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[nibanks]

Must do this because increasing the size increases the chance that 0-RTT doesn't work in the face of random packet loss.