Support strato extension with Scala syntax highlighting

Created by: ayroblu

Feature request description

So we have this strato file, which is really similar to scala, would be great to syntax highlight it as scala at least

Is your feature request related to a problem? If so, please describe.

Strato files are just black and white

Describe alternatives you've considered.

Fork SourceGraph? Seems not that easy

Additional context

cc @olafurpg https://twitter.com/olafurpg/status/1498968696542404610