Create element templates for workers

### Scenario

**Description of your use case:**

I combine `miranum-connect` annotations with `process-engine-worker` annotations to automatically create element templates for my workers using the [`element-templates-generator-maven-plugin`](https://github.com/Miragon/miranum/tree/main/connect/templates).

I would like to replace the `miranum-connect` Maven plugin with a `process-engine-worker` Maven plugin.

### Current Behaviour

I currently need to combine `process-engine-worker` with `miranum-connect` to generate element templates.

### Wanted Behaviour

`process-engine-worker` should provide a Maven (and Gradle) plugin to generate element templates for workers, removing the need to rely on `miranum-connect`.

### Motivation / Benefit

- Simplifies the setup by only depending on `process-engine-worker`
- Ensures consistency and avoids mixing multiple annotation processors
- Provides first-class support for element template generation directly within `process-engine-worker`