[GIP-61] Add Curve/Convex OHM-FraxBP to OHM pool

Abstract

This is a suggestion to add Curve v2 pools into the Allowed List / AllowedContracts for Credit Account users, applicable to OHM pool.

Motivation

There are a number of fairly high-yielding OHM farms on the market. Adding them as leverage farming options is a good opportunity to both attract new users and increase the organic yield in the pool (and as result increase DAO revenues). Idea to start with OHM-FraxBP, and later add other farm opportunities

Specification

This farm will be added to a existing Credit Manager as OHM pool already has strong limits, so there is no nee…