* Add Java runtime blueprint and metadata
Introduces a new Java blueprint with Docker Compose, template configuration, and logo for multi-version Java environments. Updates meta.json to register the Java runtime, supporting versions 8-21 for use cases like Minecraft servers and Spring Boot apps.
* Move Java Runtime entry in meta.json
Relocated the Java Runtime (Multi-Version) entry within meta.json for improved organization. No changes to the entry's content.
* Update template.toml
