Pass python File/line numbers to coreIR as metadata

[rdaly525]

Specifically it would be great to be passed data whenever:

a module is instantiated.
a wire is declared (a wire module is instantiated).
m.wire is called

This data could be used by the CoreIR verilog backend to produce much prettier verilog that could correspond pretty well to the original magma file.

[leonardt]

Done via #266, waiting for coreir dev merge