[tool] Setup Gradle

[at15]

ANTLR works best with Java, old Reika tsdb-proxy-java/ql is using Gradle instead of maven, we will continue using Gradle, but I forgot how to use Gradle entirely, this issue is used to track the progress of having a gradle project using ANTLR

• [ ] multiple projects? TAPL is quite independent from others, and might be split out in the future
  • Reika needs a type checker, a interpreter, but they may not need two different projects, just a command line parameter should work just fine
  • use different main class would just work, no need to specify the only main class for jar and build multiple jar for different project
• [x] gradle tasks for compile the parser
  • can't use gradle w/ ANLTR's tree visualization, Makefile may not work as well, ayi did work
• [x] bug, it seems gradle task always run when gradle build, use doLast solve this
• [ ] error-prone https://github.com/google/error-prone
• [ ] filter using tag, but it seems there is no way except changing gradle file manually
• [ ] tried to use the standalone launcher, but can't find the class .... https://github.com/junit-team/junit5/blob/master/documentation/src/docs/asciidoc/running-tests.adoc#running-tests-console-launcher-options java -jar junit-platform-console-standalone-1.0.2.jar -d src/main, but no test found ...