[Feature] Grouping like 'other' explorer.

Hi there! First of all, thank you for the extension. Works great so far! (I favourited a task, and ran it) .. Was wondering if you could have an option that groups tasks by their first dev-start would be in the 'dev' group, and dev-etc would also be in the 'dev' group. Having a prod-start, would be in the 'prod' group, etc.

Start by locating the existing task explorer grouping behavior and trace how task names are assigned to groups. Implement grouping by the first hyphen-delimited segment, so dev-start and dev-etc appear under dev while prod-start appears under prod, then verify the behavior in the extension.

Written by the indexing model from the issue text.