Discussion: hugging formatting for dictionaries and using commas as formatting hint

The following code:
```gdscript
for i in range(3):
properties.append({
"name": "number_%d" % i,
"type": TYPE_INT,
"hint": PROPERTY_HINT_ENUM,
"hint_string": "ZERO,ONE,TWO,THREE,FOUR,FIVE",
})
```

Will be formatted like this:

```gdscript
for i in range(3):
properties.append(
{
"name": "number_%d" % i,
"type": TYPE_INT,
"hint": PROPERTY_HINT_ENUM,
"hint_string": "ZERO,ONE,TWO,THREE,FOUR,FIVE",
}
)
```

But I think the original version reads better. I took the code from [this](https://docs.godotengine.org/en/stable/classes/class_object.html#class-object-private-method-get-property-list) example.

Also if the dictionary is shorter (I just removed the last line from the previous example):
```gdscript
for i in range(3):
properties.append({
"name": "number_%d" % i,
"type": TYPE_INT,
"hint": PROPERTY_HINT_ENUM,
})
```

It will be formatted like this:
```gdscript
for i in range(3):
properties.append({ "name": "number_%d" % i, "type": TYPE_INT, "hint": PROPERTY_HINT_ENUM })
```

But I'd expect the shape to be preserved since I have a comma at the end.

Beginne damit, die beiden Beispiele zur Dictionary-Formatierung aus dem Issue mit dem GDScript formatter zu reproduzieren und die Ausgabe mit den angeforderten Layouts zu vergleichen. Verfolge das für mehrzeilige Dictionaries, abschließende Kommas und Inline-Dictionaries verantwortliche Verhalten des Formatters; fertig ist es, wenn die Beispiele die beabsichtigte Form bewahren und das bestehende Formatierungsverhalten intakt bleibt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.