Add async typing support to commands' returns

[Andrew-Chen-Wang]

Some typing by @dvora-h didn't include the newly included async response typing.

[codecov-commenter]

Codecov Report

Merging #2010 (2dc9ebd) into master (afc83e1) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
+ Coverage   92.59%   92.61%   +0.01%     
==========================================
  Files         100      100              
  Lines       20909    20909              
==========================================
+ Hits        19361    19364       +3     
+ Misses       1548     1545       -3     

Impacted Files	Coverage Δ
redis/commands/core.py	87.23% <100.00%> (ø)
redis/asyncio/client.py	90.63% <0.00%> (+0.17%)	⬆️
tests/test_search.py	99.11% <0.00%> (+0.22%)	⬆️

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[chayim]

Thanks @Andrew-Chen-Wang as always :). I pushed a small linter fix into your branch. I hope you don't mind!

[Andrew-Chen-Wang]

np at all. hopefully i can find a chance to add some typing to the sync side for redis, but no promises 😅 can't wait for those Optionals to go away with future annotations and a pyupgrade