Appending items no longer works

[Kerollmops]

It is no longer possible to append items in the database because we are updating the updated item IDs that live after the item entries. We could move the metadata information before the item entries. We must add a test for this method.

arroy/src/writer.rs

Lines 166 to 176 in 19e0a07

	let mut updated = self
	.database
	.remap_data_type::<RoaringBitmapCodec>()
	.get(wtxn, &Key::updated(self.index))?
	.unwrap_or_default();
	updated.insert(item);
	self.database.remap_data_type::<RoaringBitmapCodec>().put(
	wtxn,
	&Key::updated(self.index),
	&updated,
	)?;