NO-JIRA: Add ClusterFuzzLite PR fuzzing

[jiridanek]

This is the basic ClusterFuzzLite integration for GitHub Actions. To enable the extra features, it is necessary to create a "storage repo", as described at https://google.github.io/clusterfuzzlite/running-clusterfuzzlite/github-actions/#storage-repo. I plan to look into it later, in subsequent PR.

[codecov-commenter]

Codecov Report

Merging #361 (8dd26f3) into main (bf92326) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #361   +/-   ##
=======================================
  Coverage   68.22%   68.22%           
=======================================
  Files         367      367           
  Lines       73232    73250   +18     
=======================================
+ Hits        49959    49974   +15     
- Misses      23273    23276    +3     

Impacted Files	Coverage Δ
python/proton/_events.py	93.52% <0.00%> (-0.31%)	⬇️
python/proton/_delivery.py	90.96% <0.00%> (-0.18%)	⬇️
python/proton/_reactor.py	78.98% <0.00%> (-0.12%)	⬇️
c/src/proactor/epoll.c	86.45% <0.00%> (-0.12%)	⬇️
c/tests/threaderciser.c	83.68% <0.00%> (-0.06%)	⬇️
python/proton/_handlers.py	71.66% <0.00%> (ø)
python/proton/_io.py	90.35% <0.00%> (+0.17%)	⬆️
python/tests/proton_tests/common.py	81.50% <0.00%> (+0.86%)	⬆️

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