[Feature]: Control group that adds new units of a type to itself

[lL1l1]

Describe the Feature

Inspired by https://www.beyondallreason.info/commands/group-units-auto

1. Select unit(s), assign to group with hotkey A.
2. When units of the same type are constructed, they are added to the group.
3. You can remove units from the group with hotkey B.

Expected Behavior

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Screenshots

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Additional context

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