Events/ event attributes on reply

[alpe]

Currently we append them as new custom events or wasm event (with attributes).
This means there can be duplicate events for wasm or custom event types. Not sure if this is (still) an issue for Tendermint.

I would also be important to document the desired behaviour in cosmwasm. On Reply the data would be overwritten but events/attributes are not.

[ethanfrey]

This definitely needs documentation. The whole events system does.

Tendermint does still have this issue... It will improve in 0.35, see comment and tendermint/tendermint#6634

It would also be good to write some tests to demonstrate expected behavior as those seem to stay up-to-date much better than docs. (And are always more clear)

[ethanfrey]

Defined in #581
Closed by #586

We will have multiple wasm events, but separated by the various entry point events