Patch ResponseParser.parse() and others to prepare for upstream bump

[jakob-keller]

Description of Change

Patch ResponseParser.parse() as well as ClientArgsCreator.get_client_args(), Endpoint.__init__(), and EventStream._parse_event() in preparation for #1323.

Based on #1328 by @stj

Assumptions

• Thanks to Patch ResponseParser and remaining subclasses #1329, we may be sure that all parsers have been patched.
• parsers.AioResponseParser and many of its subclasses have not yet been released to PyPI. It is therefore considered safe to patch .parse() and remove checks in calling codepaths.

Checklist for All Submissions

• I have added change info to CHANGES.rst: implied in first item for pending release 2.22.0
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details):
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version
• I have added URL to diff: boto/botocore@[CURRENT_BOTO_VERSION_TAG]...[NEW_BOTO_VERSION_TAG]

[codecov]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.83%. Comparing base (967665c) to head (4e5e435).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
aiobotocore/endpoint.py	77.77%	2 Missing ⚠️
aiobotocore/parsers.py	95.45%	1 Missing ⚠️
aiobotocore/response.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1347      +/-   ##
==========================================
- Coverage   90.83%   90.83%   -0.01%     
==========================================
  Files          67       67              
  Lines        6559     6569      +10     
==========================================
+ Hits         5958     5967       +9     
- Misses        601      602       +1     

Flag	Coverage Δ
unittests	90.83% <92.15%> (-0.01%)	⬇️

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[jakob-keller]

@thehesiod: Thanks for the thorough review, as always!

[thehesiod]

@thehesiod: Thanks for the thorough review, as always!

my pleasure, thanks for all the hard work!