Add 'src actions scope-query' command
Created by: mrnugget
This command is meant to help with creating action definitions. It returns the repositories that are matched by the "scopeQuery" in an action definition.
Example:
$ src actions scope-query -f ~/run-gofmt-in-dockerfile.json
github.com/sd9/ava
github.com/sd9/go-diff
github.com/sourcegraph/automation-testing
It's based on @sqs' suggestion here: https://github.com/sourcegraph/sourcegraph/issues/7850#issuecomment-577678760