ignore several subfields

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>

.gitignore

+.bloop/
 .idea/
+.metals/
 target/
 src/test/resources/test*.*
\ No newline at end of file

project/metals.sbt

+// DO NOT EDIT! This file is auto-generated.
+// This file enables sbt-bloop to create bloop config files.
+
+addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.4.3")