Add packaging and pom for plugin and application

We are currently developing a plugin for a customer and discovered that our example cannot be built.
The issue was resolved by adding the following items to the plugin and application pom.xml.
```pom```
Wouldn't it be better to fix it?

Inspect the plugin and application pom.xml files to confirm their current packaging configuration. Build the example to reproduce the failure, add the requested packaging declaration where needed, and verify that the plugin and application can then be built successfully.

Written by the indexing model from the issue text.