Improve policy definition language

[karthick-vinod]

This is an open ended issue to track on ways to Improve the policy definition language.

• Ability to mention multiple actions of a resource in a single policy statement.

{
  "resource": "<resource-hrn>",
  "action": ["<action-hrn-1>", "<action-hrn-2>", "<action-hrn-3>", ...],
  "effect": "allow"
}