sandbox: add wrapper functions to prepare templated transaction data

[pastaghost]

Issue: Certain transaction formats (Cosmos, possibly UTXO, etc) require that prepared transactions contain information from the signer to be signed properly.

In the case of Cosmos transactions, transfer messages require the from_address field to be populated with the signer's address. Delegate messages require the delegator_address field to be populated with the signer's address, etc. Modify the transaction data in CosmosTransactions.ts and substitute the values of each key to be replaced prior to signing with a $VALUE string. Add a wrapper function around the direct adaptercosmoSignTransaction call that first makes a call to cosmosGetAddress then replaces the templated fields in each of the necessary areas per transaction with the correct data. Update AssetCardListConfig and replace the callback for cosmos_signTransaction with this wrapper function.

Investigate whether the same applies to UTXO transactions.