infallible impl Payable conversion from byte arrays

[rnbguy]

The latest changes in sovereign-sdk-wip makes Spec::Address conversion from arbitrary-sized byte array fallible.

We were using this to create escrow addresses corresponding to all ics20 channels in ibc-transfer module.

To keep this escrow address creation infallible across all Spec implementations, we need to create something else - that implements Payable<Spec>.

A suggestion from sovereign-sdk team is to use ModuleId - which offers infallible conversion from arbitrary-sized byte array and also implements Payable<Spec>.

ref: Sovereign-Labs/sovereign-sdk-wip#547