Chain objects should have an asset lookup helper

[0xpatrickdev]

What is the Problem Being Solved?

With #10588, srcChain (holdingChain) is a new parameter required for the ChainHub.getAsset() lookup. This is because denoms are only unique in the context of a single chain.

For convenience, the Chain objects (RemoteChainFacade, LocalChainFacade) should also have a getAsset method, but not require srcChain. Each chain knows the correct parameter to pass to chainHub.getAsset().

Description of the Design

• add .getAsset() to RemoteChainFacade, LocalChainFacade
• add getDenomInfo() to RemoteChainFacade, LocalChainFacade
  • TODO: confirm both are needed or just one. getDenomInfo returns chainInfos, where getAsset returns chainNames

Security Considerations

Scaling Considerations

Test Plan

Upgrade Considerations