[FEAT] Support FeedRegistry on all networks

[wmitsuda]

Description
FeedRegistry contract should be deployed and supported on all Chainlink supported networks

Motivation
It currently works only on ETH mainnet. Chainlink launched this feature on mainnet 3 years ago, but since then it never expanded to other EVM chains.

Justification
I've previously requested to support it on BSC, but the issue was simply closed 2 years ago (see #6807). Since then, the situation only got worse, as we now have a plenty of other successful EVM compatible networks.

As I've already explained in the original issue, my product needs the registry otherwise we would have to hardcode all existing and future oracle combination/addresses in order to show quotes to the users, that's unmaintainable.

[zeuslawyer]

Thanks for raising this @wmitsuda . Investigating, and will update as soon as I make some headway.