[ENHANCEMENT] Add Kubernetes-compatible annotations for model.Duration fields

[ibakshay]

Description

This PR adds Kubernetes-compatible annotations to fields of type model.Duration in the imported library for Kubernetes spec fields. The following annotations are added to relevant fields:

// +kubebuilder:validation:Type=string
// +kubebuilder:validation:Format=duration

These annotations ensure that model.Duration fields are treated as strings with a duration format, resolving conflicts between the custom JSON serialization in prometheus/common and Kubernetes API expectations. This fix addresses validation errors in the Perses controller when updating Perses resources.

This change ensures compatibility between the Perses and Perses Operator.

• fixes model.Duration Serialization Incompatibility with Kubernetes API perses-operator#20

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

[celian-garcia]

Hello I have not much idea on how these annotation works but do you think it could be added directly in the prometheus model? This is what we are using.
https://github.com/prometheus/common/blob/653e0fa37b474f7af331bbfb409c0f654fb04a94/model/time.go#L171

[ibakshay]

Hello I have not much idea on how these annotation works but do you think it could be added directly in the prometheus model? This is what we are using. https://github.com/prometheus/common/blob/653e0fa37b474f7af331bbfb409c0f654fb04a94/model/time.go#L171

Thanks a lot for the pointer, @celian-garcia.
I have created a PR in prometheus/common repository .
Here is the link prometheus/common#708.
So, We can close this PR.