[FEATURE] Support three winding transformators with feeder_id

[vincentkoppen]

Describe the feature request

Currently the set_feeder_ids only takes branches into account. This could be extended to also look at three winding transformators (branch3).

Example
In the example below it would be nice if the feeder_branch_id is set to 5 (the three winding transformator)

from power_grid_model_ds import Grid
from power_grid_model_ds.arrays import LinkArray, NodeArray, ThreeWindingTransformerArray

## The grid
# (1)
#  |
#  |--- (2)
#  |
#  (3)
#  |
#  (4)

grid = Grid.empty()

nodes = NodeArray.empty(4)
nodes.id = [1, 2, 3, 4]
nodes.node_type = [1, 0, 0, 0]  # 1 = Substation, 0 = Regular Node
grid.append(nodes)

three_winding_transformers = ThreeWindingTransformerArray.empty(1)
three_winding_transformers.id = [5]
three_winding_transformers.node_1 = [1]
three_winding_transformers.node_2 = [2]
three_winding_transformers.node_3 = [3]
three_winding_transformers.status_1 = [1]
three_winding_transformers.status_2 = [1]
three_winding_transformers.status_3 = [1]
grid.append(three_winding_transformers)

links = LinkArray.empty(1)
links.id = [6]
links.from_node = [3]
links.to_node = [4]
links.from_status = [1]
links.to_status = [1]
grid.append(links)

grid.set_feeder_ids()
print(grid.node)

 id | u_rated | node_type | feeder_branch_id | feeder_node_id 
 1  |   nan   |     1     |   -2147483648    |  -2147483648   
 2  |   nan   |     0     |   -2147483648    |  -2147483648   
 3  |   nan   |     0     |   -2147483648    |  -2147483648   
 4  |   nan   |     0     |   -2147483648    |  -2147483648