Add forward edges and callgraph - #61
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`direct_calls` decodes `CodeInstance.edges` into `CallEdge`s, and `visit_calls`, `all_calls`, and `callgraph` walk them from one or more entry points. Together they give the caller-to-callee direction that complements the existing backedge traversal. Because these edges are recorded before optimization, callees that were inlined are still listed, and a call site dispatched at run time contributes one edge per applicable method. A call site whose function is typed merely as `Function` leaves no edge at all. Inference records these edges only on Julia 1.12 and later, so `direct_calls` reports that requirement as an error on older versions. Assisted-by: Claude Opus 5 <noreply@anthropic.com>
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This provides convenience utilities to extract the callgraph given an entry point.