Add default templates for async arrow fns and async generators

...dynamic-import/catch/nested-async-arrow-fn-await.template

...-import/catch/nested-async-arrow-fn-return-await.template

...ynamic-import/catch/nested-async-generator-await.template

...import/catch/nested-async-generator-return-await.template

...namic-import/default/nested-async-arrow-fn-await.template

...mport/default/nested-async-arrow-fn-return-await.template

...amic-import/default/nested-async-generator-await.template

...port/default/nested-async-generator-return-await.template

...mport/syntax/invalid/nested-async-arrow-fn-await.template

...yntax/invalid/nested-async-arrow-fn-return-await.template

...port/syntax/invalid/nested-async-generator-await.template

...-import/syntax/valid/nested-async-arrow-fn-await.template

.../syntax/valid/nested-async-arrow-fn-return-await.template

...import/syntax/valid/nested-async-generator-await.template