feat: add splice on HugrGraph ADT #98
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Uses the HugrGraph ADT added in #97.
splicereplaces a HoleOp (ignoring the index) with a DFG-rooted Hugr of matching signature, i.e. inserts the DFG.inlineDFGflattens the result, if desired. However, it'd be better to combine them - see comment.My hope ATM is that we don't need to deal with order edges since these are only added for nonlocal edges, and so we can do splicing/inlining before adding order edges.
Tests are pretty basic (i.e. about the simplest possible case, with/without inline). These should be more thorough....