feat: improve reobf task logic

[Floweynt]

• make reobf depend on dev jar task (not doing this breaks assemble.dependsOn(reobfJar))
• make assemble depend on reobf for REOBF_PRODUCTION (makes sense as default behavior - if you need reobf-ed production, build should generate that jar)

[jpenilla]

not interested in breaking changes to defaults, people can attach it to lifecycle tasks if they want to.

the other changes imply a lack of understanding of Gradle APIs, I would suggest reading https://docs.gradle.org/current/userguide/lazy_configuration.html to start