fix:add supported plugin langs in the help

Author: Niraj-Kamdar

packages/cli/src/__tests__/e2e/p1/create.spec.ts

@@ -20,7 +20,7 @@ Commands:
   app [options] <language> <name>     Create a Polywrap application. langs:
                                       typescript
   plugin [options] <language> <name>  Create a Polywrap plugin. langs:
-                                      typescript
+                                      typescript, rust, python
   template [options] <url> <name>     Download template from a URL. formats:
                                       .git
   help [command]                      display help for command