Java: Add lots of generated models

[michaelnebel]

trafficstars

In this PR we generate mixed summary models (and corresponding neutrals) and sinks for the following libraries frameworks

• https://github.com/gradle/gradle
• https://github.com/apache/avro
• https://github.com/qos-ch/slf4j
• https://github.com/apache/xmlbeans
• https://github.com/androidx/androidx

This was done in the following way (for each repository).

1. Clone the repository
2. Create a database using build-mode none.
3. Run the model generator on the database.