JAR size is up from 1.7MB at version 1.17.0

[lognaturel]

Software versions

Validate v1.19.0, Java v1.8, macOS

Problem description

Update: we could still reduce the size by removing most classes form the CSV parsing library and Kotlin. I'll leave this issue open for now.

Background, most addressed by #93
The jar produced by ./gradlew jar at version 1.17.0 was 1.7MB. For version 1.18.0, it grew to 5.6MB because of the inclusion of jackson to support geoJSON parsing. This is only applicable for external secondary instances so is not necessary. For version 1.19.0, it grew to 13MB, primarily because of the inclusion of bouncycastle for the extract-signed function. The function doesn't really need to be evaluated when running Validate but if the dependency is just excluded, it will crash. There's also a kotlin folder that adds 1.5MB for annotations.

Ideally we could reduce that size.

[lognaturel]

GradleUp/shadow#489 suggests that bouncycastle should never be included in a fat jar.

[lognaturel]

jackson is the only straightforward exclude, PR at #93 It can't currently be removed without some more work to make it optional.

I also identified the bouncycastle classes needed and included just those.