fix/update_creation_msg_liquidate_position

[aarmoa]

• Updated the logic to create the MsgLiquidatePosition message
• Added a example script on how to broadcast a MsgLiquidatePositions message

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1ef9948) 72.97% compared to head (1606c4e) 72.97%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #296 +/- ## ======================================= Coverage 72.97% 72.97% ======================================= Files 48 48 Lines 3404 3404 Branches 303 303 ======================================= Hits 2484 2484 Misses 839 839 Partials 81 81 ```

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