Update FE to be able to support new chains and tokens with minimal effort

[shanefontaine]

The high level flow to add new chains and tokens right now is to update the relevant metadata in core and to update an env var when building the FE. There are also smaller changes needed within each package to handle case-specific scenarios.

Ideally, these case-specific scenarios can be abstracted away so the addition of new chains and tokens is as simple as updating core and an env var. This may require a consolidated config file or a chain-specific class to handle some of the quirky stuff that comes along with each chain.

[miguelmota]

Resolved with 3658b2f