Configured cointype introspection

[JorikSchellekens]

ENS uses events to identify which cointypes an account configured to decide which cointypes to display on their UI. This is not possible when the information is all off-chain. The solution proposed by @makoto is to have a function on the resolver which returns the cointypes configured and, in this instance, further resolve these types using CCIP. The UI will attempt to use this function in the event that the resolving contract is not the standard one.

[FawadHa1der]

@makoto @JorikSchellekens So this does require changing the l2resolver contract to integrate cointype, perhaps writing a new l2resolver contract since Cairo 1 is right around the corner, I will start working on it but it needs more detailed discussion on the solution to inform this implementation.