Add SBT aliases for formatting including SBT files (backport #3125) (#3126)

* Add SBT aliases for formatting including SBT files (#3125)

Also run formatting on SBT files.

(cherry picked from commit 3da4113e

)

# Conflicts:
#	build.sbt
#	project/plugins.sbt

* Resolve backport conflicts

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Co-authored-by: Jack Koenig <koenig@sifive.com>