Revisit event types

[alpe]

We emit events of type sdk.EventTypeMessage mostly. They could become more useful with specific types.

[ethanfrey]

Nice idea, the TypedEvent stuff, right?

I saw this as I was parsing the abci.Events returned when dispatching an sdk.Msg and passing them to the EventManager and wondering why the method was deprecated. It would be good to use this for the ones we generate manually.

[alpe]

Sorry, I should have been more precise. This is not about the deprecated method but the string we pass as first argument https://github.com/CosmWasm/wasmd/blob/v0.15.1/x/wasm/internal/keeper/msg_server.go#L33 .
If we would use more concrete types like "contract_stored" instead of "message" then it would be easier for a client to subscribe to the right one.
I found some good example in the distribution module

Ref sdk-events