Add support for MODULE LOADEX

[dvora-h]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
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• Is the new or changed code fully tested?
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• Is there an example added to the examples folder (if applicable)?
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Description of change

closes #2125

[chayim]

Perfect

[codecov-commenter]

Codecov Report

Merging #2146 (ac13fd6) into master (cb91eed) will decrease coverage by 0.04%.
The diff coverage is 26.31%.

@@            Coverage Diff             @@
##           master    #2146      +/-   ##
==========================================
- Coverage   92.45%   92.41%   -0.05%     
==========================================
  Files         104      104              
  Lines       24364    24404      +40     
==========================================
+ Hits        22526    22552      +26     
- Misses       1838     1852      +14     

Impacted Files	Coverage Δ
redis/commands/core.py	83.63% <11.11%> (-0.38%)	⬇️
tests/test_commands.py	94.14% <40.00%> (-0.18%)	⬇️
tests/test_search.py	99.19% <0.00%> (+0.01%)	⬆️
redis/commands/search/field.py	98.57% <0.00%> (+0.08%)	⬆️

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