Add Support to Create ARM Template for policyDefinitions

The issue does not name a file, test, or entry point. Start by locating the policyDefinitions generation path and compare its current parameter-file output with the supplied JQ template; done means policyDefinitions are emitted as ARM templates with correctly handled policyRule expressions.

Describe the solution you'd like

At the moment, due to string escape requirement for policyRule, policyDefinitions Templates are generated as parameter file.

It would be great to have policyDefinitions generated as ARM template. Following JQ Template can help with that

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "metadata": {
        "_generator": {
            "name": "AzOps"
        }
    },
    "parameters": {},
    "variables": {},
    "resources": [
        {
            "type": .Type,
            "name": .name,
            "apiVersion": "2021-06-01",
            "properties": {
                "description": .properties.description,
                "displayName":  .properties.displayName,
                "metadata": {
                    "version": .properties.metadata.version,
                    "category": .properties.metadata.category
                },
                "mode": .properties.mode,
                "parameters": .properties.parameters,
                "policyRule": .properties.policyRule | walk(if type == "string" and (.|startswith("[")) then "[" + sub("^\\["; "[") else . end),
                "policyType": .properties.policyType
            }
        }
    ],
    "outputs": {}
}