Refactor codebase to async/await – `spo term group add` until `spo theme list`

-	`spo term group add`
-	`spo term group get`
-	`spo term group list`
-	`spo term list`
-	`spo term set add`
-	`spo term set get`
-	`spo term set list`
-	`spo theme apply`
-	`spo theme get`
-	`spo theme list`
