Two-lined export annotation are always placed after one-lined annotations

Given :

```gd
@export
var test_first: int

@export var test_second: int
```

It will be reformated as :

```gd
@export var test_second: int

@export
var test_first: int
```

Is this intended behaviour ?

For some cases when we have some setter/ long annotation we prefer to have this formatting :

```gd
@export_range(1, 30, 1, "prefer_slider")
var min_tiles: int = 3:
set = _set_min_tiles
```

I don't think the order of export should be modified by the formater.

Reproduce the formatter output using the two annotation snippets in the issue, then trace the formatter entry point that orders annotations. Add a regression case covering mixed one-line and two-line exports, and verify that formatting preserves their original order while keeping the reported multiline layout.

Scritto dal modello di indicizzazione a partire dal testo della issue.