WIP: Make simulator operations predetermined

[jaekwon]

I'm trying to let us skip operations/msgs from handlers without messing up the following operations, as in...

var i = 0
 func NewHandler(k keeper.Keeper) sdk.Handler {
        return func(ctx sdk.Context, msg sdk.Msg) sdk.Result {
               if ctx.BlockHeight() == <BLOCK_WITH_SUSPECTED_TX> {
                       i += 1
                       if i == <SUSPECTED_TX_NUMBER> {
                               return sdk.ErrTxDecode("just exit").Result()
                       }
               }
        ...

[codecov]

Codecov Report

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[jaekwon]

Closing this PR, preferring #2900