Creds provider

[barshaul]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Merging #16 (4c82551) into master (2cea637) will decrease coverage by 0.08%.
The diff coverage is 96.53%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   92.20%   92.11%   -0.09%     
==========================================
  Files         111      113       +2     
  Lines       28751    29063     +312     
==========================================
+ Hits        26509    26771     +262     
- Misses       2242     2292      +50     

Impacted Files	Coverage Δ
redis/cluster.py	89.85% <ø> (ø)
redis/commands/bf/__init__.py	96.73% <ø> (-3.27%)	⬇️
redis/commands/search/querystring.py	0.00% <0.00%> (ø)
setup.py	0.00% <ø> (ø)
tests/test_asyncio/test_lock.py	100.00% <ø> (ø)
redis/commands/core.py	82.06% <71.42%> (-0.05%)	⬇️
redis/asyncio/connection.py	86.61% <80.72%> (+0.50%)	⬆️
redis/connection.py	86.42% <88.00%> (-0.49%)	⬇️
redis/asyncio/lock.py	99.13% <88.88%> (+0.04%)	⬆️
redis/asyncio/cluster.py	90.77% <91.66%> (+0.48%)	⬆️
... and 44 more

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