Add committee roles and unit test to check the quality

[MansMeg]

We need to have the "utskottsuppdrag/roller" added in the database together with unit tests. This would also include a list of all the different committees over the period in the database.

[salgo60]

• one search in WD

positions appointed by regeringen "uppdrag i Sveriges riksdag"

• example the data Riksdagen deliver Q984112 = 0864542495614
  • WD Q97670208 = "Chair of the Committee on Foreign Affairs"

• Talk Q97670208 using Template PositionHolderHistory