Simplify build and test scripts

[azavea]

Simplify build and test scripts

[jisantuc]

This is a good idea and would be helpful. bloop crept in here specifically because it was the only build server that was supported when Metals shipped. However, recent versions of sbt (>=1.4) have build server protocol support, and later versions of metals support both bloop and sbt's build server protocol implementation. There are more details about that here. I've done the steps in that post in my local Franklin and have noticed two things --

1. everything Just Works ™️
2. Warnings now include scapegoat! I think that's a sign that sbt's bsp implementation gives us access to warnings from more or less arbitrary sbt plugins that we have enabled.

We were pretty much forced to use bloop with Metals initially, and now that we're not anymore, we should unify the compilation / assembly experience with a single build tool. Since we use sbt for access to the sbt plugins we use in CI and for packaging, I think the single tool should be sbt.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[pomadchin]

Up!

[pomadchin]

Closed in #54