feat(Roles): add option for icon data in role datas

[hjpalpha]

Summary

as title states

this allows to eventually migrate data from Module:PositionIcon/data to role data modules

How did you test this change?

dev as port of original #7523

[mbergen]

Should we already prepare a clean way to add non-FA icons instead of just raw wikicode strings?

[hjpalpha]

Should we already prepare a clean way to add non-FA icons instead of just raw wikicode strings?

done

although we will have to see how to handle dota2 with this when we port the data:

[Eetwalt]

#7523 (comment)

After this product decisions, do we need to have icon mapping option for Roles? Was this only for 'captain' and 'igl' or would this be beneficial for defining ingamerole icons as well?

[hjpalpha]

#7523 (comment)

After this product decisions, do we need to have icon mapping option for Roles? Was this only for 'captain' and 'igl' or would this be beneficial for defining ingamerole icons as well?

longterm we would want to get rid of Module:PositionIcon/data and move the data from it into roles
for that we would need something like this here anyways

but if we go without icons for igl/captain in TP then we can postpone this PR