Java package miss detector

[prabhu]

Probably a new contrib script. The approach is as follows:

1. Clear the maven, gradle, and sbt caches
2. Generate the SBoM with cdxgen
3. Manually collect the list of jars from both the application root and the caches directory
4. Identify package misses
5. Bonus - Compare hashes of the downloaded files with the ones in the SBoM

Repeat this process for multiple Java and Scala apps.