[widgets][experimenteditor] Add tab to visualize the toolchain

Part of #185
4 jobs for 185_toolchain_preview in 11 minutes and 34 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #205630
docker
build_linux_36

00:11:34

91.0%
passed #205631
docker
build_linux_37

00:11:25

91.0%
passed #205628
macosx
build_macosx_36

00:10:29

91.0%
passed #205629
macosx
build_macosx_37

00:10:07

91.0%