Support Loadouts for Party Tab Build import

Check for duplicates

• I've checked for duplicate open and closed issues by using the search function of the issue tracker

What platform are you running Path of Building on?

Windows

Is your feature request related to a problem?

When making an aura bot you need to export the character with supports and copy it into the party tab build import after every change.

Describe the solution you'd like

Add a dropdown under build import inside the party tab that allows me to pick my other loadout of the same pob as the party build, so I can fiddle with the other loadout and see changes hopefully in real time and possibly show the dps impact of the main build after the aura bot changes

Describe alternatives you've considered

As said above it can be achieved by exporting after every change or getting a minion and taking its stats as if it applies to party allies.

Additional context

Would solve #9984 pretty much as well

Comienza inspeccionando la importación del build de la pestaña Party y el manejo existente de los loadouts. Determina cómo otro loadout del mismo build puede actualizar el build de Party y su impacto en el DPS en tiempo real; se considera terminado cuando el dropdown solicitado y el comportamiento sincronizado funcionan sin exportar e importar repetidamente.