Train model on startup

[oliviadargel]

User story

1. As a developer
2. I want to use the NLP Component without executing specific training instructions
3. So that the model is either loaded or trained and then loaded on container startup

Acceptance criteria

• if model exists, it won't be overwritten
• if the model doesn't exist, it is trained by existing training data
• if no training data exists, they have to be generated, too
• no script needs to be executed by hand

Definition of done

• Code was reviewed by another person
• GitHub CI runs successfully
• Feature is merged into main branch