Exposing the module version in loaded_modules

[chayim]

This is useful for the case where one wants to instantiate a module, knowing the back end version. The reason: beahviours may differ based on redis module versions.

Pull Request check-list

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• 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)?

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 #1648 (1684ab6) into master (2b0a1e7) will decrease coverage by 0.02%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master    #1648      +/-   ##
==========================================
- Coverage   89.01%   88.98%   -0.03%     
==========================================
  Files          52       52              
  Lines       10112    10118       +6     
==========================================
+ Hits         9001     9004       +3     
- Misses       1111     1114       +3     

Impacted Files	Coverage Δ
redis/commands/redismodules.py	78.94% <66.66%> (-7.72%)	⬇️
redis/client.py	87.76% <100.00%> (ø)
redis/commands/json/__init__.py	100.00% <100.00%> (ø)
redis/commands/search/__init__.py	82.35% <100.00%> (+0.53%)	⬆️
tests/test_connection.py	79.41% <100.00%> (ø)
tests/test_search.py	98.15% <0.00%> (-0.16%)	⬇️

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