Support link with line numbers in the markdown editor

From #38577

**Steps to Reproduce:**

1. In project:

`a.md`:
```md
[b](./b.md#L3)
```

`b.md`:
```md
1
2
3
4
5
```

2. Click on link `./b.md#L3` in the markdown editor


**Expected**
Opens `b.md` with line 3 at top