Handle Liquidity Position Notification.story

When the ｟CSM｠ sends a Liquidity Position

Then ｟the Payment Service｠ receives a Liquidity Position Notification using predicate:
| requestId | liquidity-position |
| version.major | 1 |
| version.minor | 0 |
| version.patch | 0 |
| payload.content.csm | RT1 |
| payload.content.rawMessage | prettyPrint(#LiquidityPosition) |
| payload.version.major | 1 |
| payload.version.minor | 0 |
| payload.version.patch | 0 |