feat: Add support for anti affinity configuration in helm charts

[NotAndD]

Description

Following what was done in pull/1180, there is an annotation that can be used to enforce leader-follower anti affinity using a mutating webhook. But it's not possible to use it from the provided Helm Charts.

I added the following:

• Possibility to add the annotation on the RedisCluster resource by using redisCluster.enableMasterSlaveAntiAffinity
• Possibility to disable the creation of cert-manager Issuer (which might be not required) in case someone wants to use an existing one for the Certificate
• Possibility to create it as a ClusterIssuer, if desired. And also to use this kind of issuer in the certificate.

Type of change

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

Checklist

• Tests have been added/modified and all tests pass.
  • There are no tests for the Helm Charts (it seems)
• 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

I left the default parameters in the values to configure the chart as before, so there should be no changes, unless parameters are personalized.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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[NotAndD]

Sorry, thought the readme files were updated manually, should have noticed the templetized readmes (internal facepalm)

[drivebyer]

lgtm