### 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_MSG(p_size < 1, "TileMapQuadrant size cannot be smaller than 1.");
	quadrant_size = p_size;
	_clear_internals();
	_recreate_internals();
	emit_signal(SNAME("changed"));
}
int TileMap::get_quadrant_size() const {
	return quadrant_size;
}
int TileMap::get_layers_count() const {
	return layers.size();
}
void TileMap::add_layer(int p_to_pos) {