Source Instagram: fetch Instagram accounts directly

## Tell us about the problem you're trying to solve
Instagram source uses Facebook Pages to fetch Instagram accounts.
So you have to be explicitely "admin" of every facebook page to fetch data from the according Instagram accounts...
1) This is a strange way to fetch Instagram account, because they are linked directly to Facebook Business Manager Account ; and if you are BM admin you can fetch the datas without being explicitely admin of every page/account.
2) You can manage an Instagram account without having rights to manage the Facebook page
3) If you manage a lot of instagram accounts, you neeed to filter wich accounts you wants to sync

## Describe the solution you’d like
I think you could add an "accounts filter" to Instagram source setup (as LinkedIn Ads source) where we could put Instagram accounts numbers we would like to fetch ? The you could fetch the designated accounts directly (without going through Facebook pages)