ENH: Check if different transformer/line parameters with the same ID are used

[alihamdan]

The following should raise an error because two different TransformerParameters objects with the same ID are used in the same network

tp1 = rlf.TransformerParameters(id="TP", ...)
tp2 = rlf.TransformerParameters(id="TP", ...)

tr1 = rlf.Transformer(parameters=tp1, ...)
tr2 = rlf.Transformer(parameters=tp2, ...)

en = rlf.ElectricalNetwork(transformers=[tr1, tr2], ...)  # <- this should raise an error

[alihamdan]

This is more difficult than I thought, I'll leave it for later.

FTR, currently a network works fine if it has different parameters with duplicate IDs. The problem is when a network is serialized to a dict/JSON then all duplicates get replaced by the first parameters object.