4.x - Archetype: Create new archetype layout

[tvallin]

Environment Details

• Helidon Version: 4.0.10
• Helidon SE and Helidon MP
• JDK version: 21
• OS: n/a
• Docker version (if applicable): n/a

---

Problem Description

See #7884 - Contains all information about the new archetype layout.

Summary:

• Improve archetype readability by introducing a new directory structure
• Split input and output in different files

Steps to reproduce

none