Refactor `check_unique` to `Checked{Graph,Node}`#668

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kkysen wants to merge 1 commit intokkysen/pfb/unique-checking/check-unique-refactorfrom kkysen/pfb/unique-checking/checked-graph

+275-359

Commits on Sep 16, 2022

Added Checked{Graph,Node}, which encapsulates creating the graph and running .check_unique(). It also preserves the Rust source code in debug info.
kkysen
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