Events Duplicated on Multi-Msg Txs

[alexanderbez]

Summary of Bug

A tx with multiple messages will have events duplicated. e.g. for a tx with two messages, the 2nd message will have events for the 1st message in addition to its own events.

Each handler sets a new event manager so it's not immediately clear how or why this happens.

Version

v0.37.3

Steps to Reproduce

Submit a tx with at least two messages, and you'll see something like the following:

               { 
                     "type":"withdraw_rewards",
                     "attributes":[ 
                        { 
                           "key":"amount",
                           "value":"107muon"
                        },
                        { 
                           "key":"validator",
                           "value":"cosmosvaloper1wtv0kp6ydt03edd8kyr5arr4f3yc52vp3u2x3u"
                        },
                        { 
                           "key":"amount",
                           "value":"80719596muon"
                        },
                        { 
                           "key":"validator",
                           "value":"cosmosvaloper1msz843gguwhqx804cdc97n22c4lllfkk5352lt"
                        }
                     ]
                  }

which should be:

               { 
                     "type":"withdraw_rewards",
                     "attributes":[ 
                        { 
                           "key":"amount",
                           "value":"80719596muon"
                        },
                        { 
                           "key":"validator",
                           "value":"cosmosvaloper1msz843gguwhqx804cdc97n22c4lllfkk5352lt"
                        }
                     ]
                  }

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