Refactor codebase to async/await – `spo sitedesign get` until `spo sitedesign task get`

-	`spo sitedesign get`
-	`spo sitedesign list`
-	`spo sitedesign remove`
-	`spo sitedesign rights grant`
-	`spo sitedesign rights list`
-	`spo sitedesign rights revoke`
-	`spo sitedesign run list`
-	`spo sitedesign run status get`
-	`spo sitedesign set`
-	`spo sitedesign task get`
 
