[ARFC] Ethereum v2 Collector Contract Consolidation

[MarcZeller]

@miguelmtz

PS: It seems the convention in the community is to use ARC instead of ARFC, fyi.

as a side-note while the “official Aave Request for Comment” terminology is ARC, the emergence of the ARC market might create some confusion,

using ARFC is an alternative that makes sense to me, and I have no opposition to its usage.