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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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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