chore: add prettier ignore (#1998)

Author: aeneasr

.prettierignore

@@ -14,4 +14,5 @@ playwright-report/
 src/plugins/
 docs/keto/reference/proto-api.mdx
 vendor
-code-examples/sdk/typescript/src/**/*.hbs
+code-examples/sdk/typescript/src/**/*.hbs
+**/.dart_tool