[GROW-3262] add __repr__ to RedisCluster objects

[zach-iee]

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?
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Description of change

when looking through sentry, it's hard to debug redis-py related issues, because object is not represented well. This PR added __repr__ method to NodeCommands and PipelineCommand to show data on sentry

current:

with this PR:

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.05% ⚠️

Comparison is base (d5533db) 92.35% compared to head (ae41464) 92.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   92.35%   92.31%   -0.05%     
==========================================
  Files         119      119              
  Lines       30678    30682       +4     
==========================================
- Hits        28334    28325       -9     
- Misses       2344     2357      +13     

Files Changed	Coverage Δ
redis/cluster.py	90.71% <50.00%> (-0.19%)	⬇️

... and 8 files with indirect coverage changes

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