Refactor codebase to async/await - `spo serviceprincipal set` until `spo site apppermission set`

-	`spo serviceprincipal set`
-	`spo site add`
-	`spo site appcatalog add`
-	`spo site appcatalog list`
-	`spo site appcatalog remove`
-	`spo site apppermission add`
-	`spo site apppermission get`
-	`spo site apppermission list`
-	`spo site apppermission remove`
-	`spo site apppermission set`
