add E2E Pystein and generic binding tests for EventGrid

[pdthummar]

Description

Fixes #

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1031 (7c8e846) into dev (5f28c27) will decrease coverage by 52.54%.
The diff coverage is n/a.

❗ Current head 7c8e846 differs from pull request most recent head b7b555d. Consider uploading reports for the commit b7b555d to get more accurate results

@@             Coverage Diff             @@
##              dev    #1031       +/-   ##
===========================================
- Coverage   84.01%   31.47%   -52.55%     
===========================================
  Files          34       34               
  Lines        1858     1846       -12     
  Branches      299      299               
===========================================
- Hits         1561      581      -980     
- Misses        232     1264     +1032     
+ Partials       65        1       -64     

Flag	Coverage Δ
unittests	31.47% <ø> (-52.55%)	⬇️

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

Impacted Files	Coverage Δ
...e_functions_worker/bindings/nullable_converters.py	21.62% <0.00%> (-78.38%)	⬇️
azure_functions_worker/functions.py	23.72% <0.00%> (-72.32%)	⬇️
azure_functions_worker/dispatcher.py	19.20% <0.00%> (-69.93%)	⬇️
azure_functions_worker/utils/tracing.py	31.81% <0.00%> (-68.19%)	⬇️
azure_functions_worker/utils/common.py	33.33% <0.00%> (-66.67%)	⬇️
azure_functions_worker/utils/dependency.py	32.57% <0.00%> (-60.61%)	⬇️
azure_functions_worker/bindings/meta.py	25.30% <0.00%> (-57.84%)	⬇️
...s/shared_memory_data_transfer/shared_memory_map.py	28.57% <0.00%> (-55.36%)	⬇️
azure_functions_worker/extension.py	43.92% <0.00%> (-55.16%)	⬇️
.../shared_memory_data_transfer/file_accessor_unix.py	19.60% <0.00%> (-54.91%)	⬇️
... and 16 more

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