Add branch in matches

[Drarig29]

As Toornament does here https://developer.toornament.com/v2/doc/organizer_bracket_nodes, it would be nice to add branch (wb, lb, gf) in matches.

Thanks to that, we would directly know if a bracket match is in the winner bracket, the loser bracket or the grand final instead of having to get the parent group and getting its number.