Linkage Monitor to have an option to show the debug output

When I have to troubleshoot Linkage Monitor, I'll have to compare the content of baseline BOM and snapshot BOM. Is there any good way to see the difference quickly?

```
for (int i = 0; i < baselineCoordinates.size(); ++i) {
String elementB = baselineCoordinates.get(i);
String elementS = snapshotCoordinates.get(i);
if (elementB.equals(elementS)) {
continue;
}
System.out.println("baseline: " + elementB + ", snapshot:" + elementS);
}
```

What if some elements are only in baseline or snapshot? What's the best way to compare 2 list of Maven coordinates?

先找出 Linkage Monitor 的進入點，以及比較 baseline 和 snapshot BOM Maven 座標清單的程式碼。確認 debug-output 選項應如何呈現差異，包括只存在於其中一個清單中的元素。完成的標準是：在進行疑難排解時，monitor 能清楚顯示相符項目和單邊差異。

由索引模型根據 Issue 內容生成。