support redis cluster transport

[zs-neo]

Attempt to address #1021

Thank you very much for your code, it helps us a lot. @auvipy

We use redis-py instead of redis-py-cluster because redis-py-cluster has been merged into redis-py.
Celery works fine on our cluster with multi producers and multi consumers, when a node goes down, it can automatically switch.

celery==5.4.0
Django==4.1
django-celery-beat==2.7.0
django-celery-results==2.5.1
django-filter==24.3
django-redis==5.4.0
django-split-settings==0.3.0
django-timezone-field==5.1
djangorestframework==3.15.2
gunicorn==22.0.0
pyOpenSSL==21.0.0
redis==5.0.0
requests==2.22.0
uWSGI==2.0.18

app = Celery('celery_test', broker='rediscluster://:myredis@127.0.0.1:7024')

[codecov]

Codecov Report

Attention: Patch coverage is 67.87565% with 62 lines in your changes missing coverage. Please review.

Project coverage is 81.22%. Comparing base (1220144) to head (b4405fa).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
kombu/transport/rediscluster.py	67.70%	45 Missing and 17 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2204      +/-   ##
==========================================
- Coverage   81.49%   81.22%   -0.28%     
==========================================
  Files          77       78       +1     
  Lines        9509     9702     +193     
  Branches     1148     1187      +39     
==========================================
+ Hits         7749     7880     +131     
- Misses       1569     1614      +45     
- Partials      191      208      +17     

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