Decouple suggestedRoutes from marketManager.FetchPrices

[IvanBelyakoff]

Problem

Currently in router's suggestedRoutes we call marketManager.FetchPrices to get fiat values and return them, but if market providers fail (conigecko, cryptocompare), we receive no routes error, though we actually can get routes, just not fiat values for the fees. We should separate the logic and make an extra call from client side for the fees values or at least do not consider market providers failure as a blocker error.

Acceptance Criteria

Suggested routes must be returned independently of market providers