Enhance CreateSpotOrder to emit events and return OrderId on market b… (

#1045)

Enhance CreateSpotOrder to emit events and return OrderId on market buy execution

- Updated the CreateSpotOrder function to emit an event upon successful execution of a market buy order.
- Modified the response to include the OrderId of the pending spot order, improving the feedback provided to the user.
- These changes enhance the order processing flow and provide better tracking of executed orders.

x/tradeshield/keeper/msg_server_spot_order.go

@@ -25,11 +25,16 @@ func (k msgServer) CreateSpotOrder(goCtx context.Context, msg *types.MsgCreateSp
 
 	// if the order is market buy, execute it immediately
 	if msg.OrderType == types.SpotOrderType_MARKETBUY {
-		_, err := k.ExecuteMarketBuyOrder(ctx, pendingSpotOrder)
+		res, err := k.ExecuteMarketBuyOrder(ctx, pendingSpotOrder)
 		if err != nil {
 			return nil, err
 		}
-		return &types.MsgCreateSpotOrderResponse{}, nil
+
+		ctx.EventManager().EmitEvent(types.NewExecuteSpotOrderEvt(pendingSpotOrder, res))
+
+		return &types.MsgCreateSpotOrderResponse{
+			OrderId: pendingSpotOrder.OrderId,
+		}, nil
 	}
 
 	// add the order to the pending orders