Convert pystein asgi to use handle_async

[YunchuWang]

[codecov[bot]]

Codecov Report

Merging #145 (0fed114) into dev (093825e) will increase coverage by 0.04%. The diff coverage is 87.50%.

:exclamation: Current head 0fed114 differs from pull request most recent head 74db5c7. Consider uploading reports for the commit 74db5c7 to get more accurate results

@@            Coverage Diff             @@
##              dev     #145      +/-   ##
==========================================
+ Coverage   90.30%   90.34%   +0.04%     
==========================================
  Files          53       53              
  Lines        3042     3035       -7     
  Branches      276      805     +529     
==========================================
- Hits         2747     2742       -5     
+ Misses        218      216       -2     
  Partials       77       77              

Flag	Coverage Δ
unittests	90.31% <87.50%> (+0.04%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
azure/functions/decorators/__init__.py	100.00% <ø> (ø)
azure/functions/decorators/function_app.py	99.20% <86.66%> (-0.27%)	:arrow_down:
azure/functions/__init__.py	100.00% <100.00%> (ø)
azure/functions/_http_wsgi.py	91.00% <0.00%> (-0.09%)	:arrow_down:
azure/functions/_http_asgi.py	90.32% <0.00%> (ø)
azure/functions/_abc.py	75.82% <0.00%> (+0.02%)	:arrow_up:
azure/functions/_cosmosdb.py	88.88% <0.00%> (+3.88%)	:arrow_up:

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