Minutes and resolveAfterMinutes data type

[mnkg561]

Is this a BUG REPORT or FEATURE REQUEST?:
Feature

What happened:
Minutes and resolveAfterMinutes are declared as int since wavefront allows only integer values. This should be fine for single alert creation but if users wants to use go lang template to variablize based on the requirements kubectl or open api will throw an error since go lang template {{ .foo }} is a string and not an integer.

Allow Minutes and resolveAfterMinutes as custom data type StringOrInt? - May be, depends on the requirement we can figure it out

What you expected to happen:
Minutes and resolveAfterMinutes can also parameterized using Go Lang template with AlertsConfig supplying the data

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• alert-manager version
• Kubernetes version :

$ kubectl version -o yaml

Other debugging information (if applicable):

- controller logs:

$ kubectl logs