`generate-method-action-types.ts` does not take services into account

`generate-method-action-types.ts` is the script that generates types for actions that map to methods in controllers. However, in order for services to be designed to use the messaging system, we need this script to generate the same kinds of types for services as well.

Start by locating generate-method-action-types.ts and reading how it currently handles controller methods. Trace the generated action types and the service messaging use case described in the issue. Done means services receive the same kind of generated types as controllers, with the existing generation or validation checks passing.

Written by the indexing model from the issue text.