* Modify the `java_package` setting in our two `.proto` source files
* Move 2 existing generated-but-checked-in Protos.java files to
dedicated packages (i.e. packages without hand-coded "artisanal" files)
This is a step towards more compatibility with ProtoBuf tooling which
sometimes likes to delete the generated files and:
> can't distinguish between "old generated code" and "your artisan source files."
and more importantly it is a step towards fixing Gradle 8 caching issues.
