Atrium: compile android class files into dex bytecode

[robstoll]

Platform (jvm, jdk8, js, android): android

Code related feature

Currently we don't have a proof that the class files are actually compatible with d8.
It would be nice if we could compile the resulting class files of a build of an -android module with the d8 dexer.

TODO:

• [ ] create a gradle task checkDexer (based on JavaExec) for all android projects => do that in the build.gradle in the root -> use configure(getAndroidProjects()){...}. The task shall convert all class files to dex-files using the d8 dexer
• [ ] make sure check depends on the new task and make sure it is run after compileKotlin (use dependsOn)

Some additional hints (the rest needs to be researched):

• docu on how JavaExec works https://docs.gradle.org/current/dsl/org.gradle.api.tasks.JavaExec.html
• dependency to r8 which includes d8 is described here https://mvnrepository.com/artifact/com.android.tools/r8/1.6.84 (not sure in which repositories it is published)
• repo of r8, probably contains further information on how to use it: https://r8.googlesource.com/r8

[segunfamisa]

I'll work on this

[robstoll]

@segunfamisa do you need help? un-assining you so that someone else can take over

[assaflei]

I'll try taking this