### 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
if (atlas_source) {
					const TileData *tile_data;
					if (q.runtime_tile_data_cache.has(E_cell)) {
						tile_data = q.runtime_tile_data_cache[E_cell];
					} else {
						tile_data = atlas_source->get_tile_data(c.get_atlas_coords(), c.alternative_tile);
					}
					q.navigation_regions[E_cell].resize(tile_set->get_navigation_layers_count());
					for (int layer_index = 0; layer_index < tile_set->get_navigation_layers_count(); layer_index++) {
						Ref<NavigationPolygon> navigation_polygon;
						navigation_polygon = tile_data->get_navigation_polygon(layer_index);
						if (navigation_polygon.is_valid()) {
							Transform2D tile_transform;
							tile_transform.set_origin(map_to_local(E_cell));
							RID region = NavigationServer2D::get_singleton()->region_create();
							NavigationServer2D::get_singleton()->region_set_owner_id(region, get_instance_id());
							NavigationServer2D::get_singleton()->region_set_map(region, get_world_2d()->get_navigation_map());
							NavigationServer2D::get_singleton()->region_set_transform(region, tilemap_xform * tile_transform);
							NavigationServer2D::get_singleton()->region_set_navigation_layers(region, tile_set->get_navigation_layer_layers(layer_index));
							NavigationServer2D::get_singleton()->region_set_navigation_polygon(region, navigation_polygon);
							q.navigation_regions[E_cell].write[layer_index] = region;
						}
					}
				}
			}
		}
		q_list_element = q_list_element->next();
	}
}
void TileMap::_navigation_cleanup_quadrant(TileMapQuadrant *p_quadrant) {