docs(fingerprint): document the encoding of Cargo's depinfo #14745
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What does this PR try to resolve?
When investigating #14712,
I figured that it lacks of docs for the Cargo's depinfo format.
Hence documenting them.
This PR also move dep info files related items to a separate module.
How should we test and review this PR?
No behavior change, though I may submit a hack of #14712 after this.
I didn't move dep-info specific documentation into that new module.
It feels more nature for keeping them all in the fingerprint module.