Track Events Emitted from the AnteHandler

[alexanderbez]

Summary of Bug

Events were initially designed and intended to be emitted during message handlers and ABCI begin/end block executors. However, due to the design and various use cases IBC introduces, it is desirable to also emit events during the AnteHandler.

Any events currently emitted during the AnteHandler will not be captured and returned to Tendermint. I think we can easily support and fix this by updating BaseApp#runTx to grab the events from ctx and add/merge them into the result's events before returning.

Version

138e0b0

/cc @zmanian @fedekunze

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