Append permissions to work around TF provider issue

[maniSbindra]

Fixes #49

• This is to workaround the Terraform azurerm provider, Application Insights resource Issue . As a workaround, the utility automatically appends missing required permissions when Microsoft.Insights/components/read or Microsoft.Insights/components/write permissions are detected as missing permissions.
  When Microsoft.Insights/components/read is detected Microsoft.Insights/components/currentbillingfeatures/read and Microsoft.AlertsManagement/smartDetectorAlertRules/read permissions are appended. Similarly, when Microsoft.Insights/components/write is detected Microsoft.Insights/components/currentbillingfeatures/write and Microsoft.AlertsManagement/smartDetectorAlertRules/write permissions are appended.
• Implement functionality to append permissions in such special cases (currently aware of only one such case)
• Add Unit Tests
• Modify app insights e2e test to reflect added permissions
• Modify docs

[DariuszPorowski]

LGTM