Feature Request: Scarlet/Violet tracker should include all Vivillon forms

[Fleker]

Vivillon is a Pokemon who, when it evolves from Spewpa, can become one of many different forms. However, this only appears once in the tracker.

Particularly in the case of shiny hunting, where it's now possible to get the majority of shiny Vivillon forms in SV since v1.2, it is very difficult to track which ones you've gotten so far.

I haven't started shiny hunting these yet, but when I do it will be a tough process to remember which ones I've got and which I need. Pokedex Tracker should in theory support this, as the alternative option will be some kind of alternative tracker.

[ami]

Merging into https://github.com/pokedextracker/pokedextracker.com/issues/256 as this is a generic request to support alternative forms.