Raising NotImplementedError for certain CLUSTER commands

[dvora-h]

Pull Request check-list

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Description of change

closes #1968
closes #1969

[dvora-h]

@shacharPash @vladvildanov

[shacharPash]

I didn't quite understand why these commands need to be written just for them to send an error that says that on purpose they are not implemented, wouldn't that just confuse the user?

[codecov-commenter]

Codecov Report

Base: 92.21% // Head: 92.20% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (1db497e) compared to base (3fb65de).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2504      +/-   ##
==========================================
- Coverage   92.21%   92.20%   -0.01%     
==========================================
  Files         113      113              
  Lines       29347    29357      +10     
==========================================
+ Hits        27061    27070       +9     
- Misses       2286     2287       +1     

Impacted Files	Coverage Δ
redis/commands/cluster.py	94.02% <100.00%> (+0.13%)	⬆️
tests/test_cluster.py	96.79% <100.00%> (-0.11%)	⬇️
tests/test_asyncio/test_pubsub.py	99.37% <0.00%> (-0.16%)	⬇️
tests/test_search.py	99.15% <0.00%> (+0.21%)	⬆️

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