Add feature flag support

[Rahul-D78]

Feature flags, also known as feature toggles, are a critical feature for managing feature releases and controlling the activation or deactivation of specific functionalities. This feature will provide greater flexibility, control, and safety in our deployment and release processes.

Implementation Options:

There are multiple ways to implement feature flags such as:

• Dedicated tool like openfeature
• Kubernetes ConfigMaps or custom resources to store feature flag configurations.
• Using environment variables to control feature flag states.
• Configure it as a GO command line flag.

opts := zap.Options{
  Development: true,
}
opts.BindFlags(flag.CommandLine)

// combine both flagsets and parse them
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
features.OperatorFeatureGate.AddFlag(pflag.CommandLine)
pflag.Parse()

This way, the feature flags can be configured runtime via flags in managers deployment manifest.

 containers:
  - command:
    - /manager
    args:
    - --leader-elect
    - --feature-gates=FeatureName=true
    - --feature-gates=FeatureName=false

[Rahul-D78]

Not required