up(semantics): add method to print dot graphs

[DonIsaac]

What This PR Does

Moves DOT graph creation logic out of SemanticTester and our CFG example and into ControlFlowGraph's API. This logic now lives in ControlFlowGraph::dot().

Why?

1. This lets us render DOT graphs in the OXC website
2. Consumers of the oxc crate may want to visualize and debug control flow graphs. This lets them do so easily.

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[codspeed-hq]

CodSpeed Performance Report

Merging #3542 will not alter performance

_{Comparing don/up/semantic/cfg-dot (6844551) with main (dd42f27)}

Summary

✅ 22 untouched benchmarks

[rzvxa]

I've added something similar in this series of PRs #3381.
https://github.com/oxc-project/oxc/blob/b92c5f0e353f9a398c4def7fa59f2422fed1969b/crates/oxc_semantic/src/control_flow/dot.rs

I'm really close to finishing this stack so you may want to wait for that(or merge this in before the said stack and I merge them together).

[Boshen]

Nice! Let's wait for the cfg stack, it's a tremendous of work 🌹

[Boshen]

Closing as stale, feel free to submit another one basing on the current cfg crate.