Add a certain marker to indicate overridden functions

### Godot version

4.4

### VS Code version

1.101.2

### Godot Tools VS Code extension version

2.5.1

### System information

Linux

### Problem statement

There aren’t any visual markers for overridden functions in vscode:

For comparison, godot editor has an arrow on the left of overriden function:

### Proposed solution

I'm not very familiar with vscode extensions, but I hope there's some way to mark overridden functions, such as with a specific color or underline.