Make Types in ResourceIdentifier public

[fengzhou-msft]

Make Types in ResourceIdentifier public as we need it to parse the parameters in ids like /subscriptions/{subscriptionId}/resourcegroups/{resourceGroupName}/providers/{resourceProviderNamespace}/{parentResourcePath}/{resourceType}/{resourceName}/providers/Microsoft.Authorization/policyAssignments

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[fengzhou-msft]

To avoid error CA1826: Do not use Enumerable methods on indexable collections. Instead use the collection directly.