feat: enhance RedisCluster resource management by introducing separate resource handling for leader and follower

[drivebyer]

• Added methods to retrieve resources for Redis leader and follower, allowing for more granular resource management.
• Updated RedisClusterSpec to deprecate the unified resources field in favor of individual configurations for leader and follower.
• Adjusted related tests and YAML configurations to reflect these changes, ensuring consistency and correctness in resource allocation.

This update improves the flexibility and efficiency of resource management in RedisCluster deployments.

PS: this PR is part of #1188; #1186

Description

Fixes #ISSUE

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.

Additional Context

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 29.26%. Comparing base (60ef5a2) to head (a4bbf9b).
Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
api/v1beta2/rediscluster_types.go	70.00%	2 Missing and 1 partial ⚠️
pkg/k8sutils/redis-cluster.go	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1199      +/-   ##
==========================================
- Coverage   30.20%   29.26%   -0.94%     
==========================================
  Files          55       57       +2     
  Lines        6294     6601     +307     
==========================================
+ Hits         1901     1932      +31     
- Misses       4200     4473     +273     
- Partials      193      196       +3     

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