(feat): Support 'commit' types

[sfc-gh-ajia]

Feature summary

Support 'commit' types in PathKind

Problem / motivation

I'm trying to gitingest OSS commits (like this one), but I'm getting a 'commit' is not a valid PathKind error. Is it possible to support ingesting commit types?

Proposed solution

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Alternatives considered

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Which interface would this affect?

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Additional context, screenshots, or examples

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