### Godot version

v4.0.beta11.official [91713ced8]

### System information

MX Linux 21

### Issue description

In Godot 3, TileMap had methods get_used_cells() and get_used_cells_by_id(). Godot 4's TileMap only has get_used_cells() and is missing get_used_cells_by_id().

get_used_cells_by_id() is highly useful in multiple cases, for example when trying to get all cells that are of road type, to randomly spawn a car.

Re-implementing get_used_cells_by_id() should be simple. The method could simply call get_used_cells(), and ignore all cells that are of the wrong ID.

### Steps to reproduce

N/A

### Minimal reproduction project

N/A
ERR_FAIL_COND_V(!tile_set.is_valid(), Vector2());
	Vector2 ret = p_pos;
	TileSet::TileShape tile_shape = tile_set->get_tile_shape();
	TileSet::TileOffsetAxis tile_offset_axis = tile_set->get_tile_offset_axis();
	if (tile_shape == TileSet::TILE_SHAPE_HALF_OFFSET_SQUARE || tile_shape == TileSet::TILE_SHAPE_HEXAGON || tile_shape == TileSet::TILE_SHAPE_ISOMETRIC) {
		
		
		if (tile_offset_axis == TileSet::TILE_OFFSET_AXIS_HORIZONTAL) {
			switch (tile_set->get_tile_layout()) {
				case TileSet::TILE_LAYOUT_STACKED:
					ret = Vector2(ret.x + (Math::posmod(ret.y, 2) == 0 ? 0.0 : 0.5), ret.y);
					break;
				case TileSet::TILE_LAYOUT_STACKED_OFFSET:
					ret = Vector2(ret.x + (Math::posmod(ret.y, 2) == 1 ? 0.0 : 0.5), ret.y);
					break;
				case TileSet::TILE_LAYOUT_STAIRS_RIGHT:
					ret = Vector2(ret.x + ret.y / 2, ret.y);
					break;
				case TileSet::TILE_LAYOUT_STAIRS_DOWN: