Adding support for triggered functions (TFUNCTION)

[shacharPash]

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)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

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

Patch coverage: 94.16% and no project coverage change.

Comparison is base (8370c4a) 90.97% compared to head (ce50b83) 90.98%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2861    +/-   ##
========================================
  Coverage   90.97%   90.98%            
========================================
  Files         126      126            
  Lines       32178    32298   +120     
========================================
+ Hits        29273    29385   +112     
- Misses       2905     2913     +8     

Files Changed	Coverage Δ
redis/cluster.py	92.70% <ø> (ø)
redis/commands/core.py	87.12% <81.57%> (-0.12%)	⬇️
redis/commands/cluster.py	93.08% <100.00%> (+0.07%)	⬆️
tests/test_cluster.py	97.44% <100.00%> (+0.05%)	⬆️
tests/test_commands.py	97.39% <100.00%> (+0.03%)	⬆️

... and 1 file with indirect coverage changes

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[chayim]

@shacharPash @dvora-h @uglide any other comments?