Add redis.asyncio.Connection instrumentation

[lrafeei]

This PR

• Adds instrumentation for redis.asyncio.Connection
• Drops Flask support for Python 2.7 since the last version of Flask to support Python 2.7 (v1.1.2) is outside New Relic's supportability window (Since April 2022)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	3		0	5.41s
✅ PYTHON	black	4	0	0	1.36s
✅ PYTHON	flake8	4		0	0.69s
✅ PYTHON	isort	4	0	0	0.23s
✅ PYTHON	pylint	4		0	9.26s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

MegaLinter is graciously provided by

[codecov-commenter]

Codecov Report

Merging #919 (060036b) into main (b1be563) will decrease coverage by 0.04%.
The diff coverage is 73.68%.

❗ Current head 060036b differs from pull request most recent head 6ad4c2e. Consider uploading reports for the commit 6ad4c2e to get more accurate results

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
- Coverage   81.46%   81.43%   -0.04%     
==========================================
  Files         186      186              
  Lines       18700    18728      +28     
  Branches     3278     3289      +11     
==========================================
+ Hits        15234    15251      +17     
- Misses       2533     2536       +3     
- Partials      933      941       +8     

Files Changed	Coverage Δ
newrelic/hooks/framework_flask.py	88.79% <ø> (-0.29%)	⬇️
newrelic/hooks/datastore_redis.py	84.82% <71.42%> (-4.37%)	⬇️
newrelic/config.py	71.29% <100.00%> (ø)

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more