Add functions to retrieve connection distance#144
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The main two functions added are:
PortSlice.get_connection_distance() -> Option<i64>PortSlice.get_connected_port_slice_and_distance() -> Option<(PortSlice, i64)>Limited to single-bit
PortandPortSlicetypes, and will returnNoneif there is a tieoff or multi-fanout.I included some sample application code in
examples/derived_pins.rsto show how these features can be used to write a report of connection distances for multi-bit ports, over a module hierarchy.