[PAPER MANIFEST] Add ClassLoader and Bootstrapper auto-creation option.

[tgbhy]

Minecraft Development for IntelliJ plugin version

2025.2-1.8.6 (or all versions ?)

Description of the feature request

This feature is to have a Bootstrapper and ClassLoader creation option instead of having to create them ourself.

It should be seeable only when paper manifest is active, it can be a whole category for Paper Manifest if you want.

[tgbhy]

Another thing would be to detect Bootstrapper and ClassLoader options (in paper-plugin.yml) as the main field do. And make bootstrap detected class as used (the same way as the JavaPlugin class do.