multi-test: Bank returns realistic events

[ethanfrey]

It should return a transfer event with a few attributes: https://github.com/cosmos/cosmos-sdk/blob/84c33215658131d87daf3c629e909e12ed9370fa/x/bank/keeper/send.go#L142-L147

Actually, maybe the message one as well, although we strip that off when it is called from a wasm contract.

Let's go and make this as close to x/wasm behavior as possible, especially as some reply blocks may look at the events.