[Routing] Add script to pre-generate instantiate/update msgs from chain registry

[nicolaslara]

The registry contracts need to be instantiated with the following information:

• Chain-Channel mappings from the chain registry
• IBC denoms from the chain registry (pending on [Routing] Add denom name registry #5451)
• Chain-Bech32 mappings prefixes from the chain registry
• A global admin address and (optionally) admin addresses for other chains

The first there should be optionally set on initialization via a script. The same script should allow the global admin to update those values based on changes to the chain registry. The script would ideally allow us to preview changes before sending in a readable way.

Note that "changing" should almost never be used once something is set (only the owner, i.e.: governance, can do this). If something changes, we should just disable the existing mapping.

Refs:

• chain registry: https://github.com/cosmos/chain-registry/tree/master
• the latest contracts are in this unmerged pr: XCS: Recovery on pre-swap unwind #5257