Update printer.ts to support kind = 'get'/'set' on TSMethodSignature

`TSMethodSignature` has a `kind` property which can be set to `method` (the default), `get`, and `set`. When `get` and `set`, the method is a getter or a setter, and as such, should be prefixed with either `get ` or `set `.

lib/printer.ts

@@ -2335,6 +2335,12 @@ function genericPrintNoParens(path: any, options: any, print: any) {
       return concat(parts);
 
     case "TSMethodSignature":
+      if (n.kind === 'get') {
+        parts.push('get ')
+      } else if (n.kind === 'set') {
+        parts.push('set ')
+      }
+
       if (n.computed) {
         parts.push("[", path.call(print, "key"), "]");
       } else {