Inline hugr functions

[doug-q]

we need to inline all functions to product valid qir.

We can do this in llvm, but I suggest we should do it in hugr, using:

• InlineCall: feat: Rewrite for inlining a single Call hugr#1934
• CallGraph: https://docs.rs/hugr/0.14.4/hugr/algorithms/call_graph/index.html

We should create an Inline pass. I suggest that:

• It should go into hugr-passes.
• It should take as input a Vec<Node> and an &mut impl HugrMut. These nodes must be Call nodes.
• The pass should construct a call graph from the hugr and ensure that the edges corresponding to the input calls do not form a cycle in the call graph. If they do, then return a "Can't inline a recursive cycle" error.
• The pass should reverse-"toposort" the input call nodes in the call graph (https://docs.rs/petgraph/latest/petgraph/algo/fn.toposort.html).
• It should then iterate the sorted list and apply InlineRewrite to the call nodes. This reverse-toposort ensures that we always inline a call before the function-thats-the-parent-of-the-call is inlined. Otherwise there would be copies of the input calls(with different Node ids) that would not be inlined

We should then create an InlineEverything pass here that collects all the call nodes in the Hugr and applies the Inline pass.