feat: Implement dependency review and dependency submission APIs

[awedist]

Relates to #2825

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Before the change?

Octokit did not support the Dependency Graph APIs.

After the change?

• Ability to request dependency diffs between two commits.
• Ability to create a dependency snapshot for a given repository.
• Ability to request a Software Bill of Materials for a given repository.

I could not implement the SBOM functionality because the SBOM GitHub API provides a JSON where the keys are in camel case.
If there is a way to configure the deserializer to accept camel case, please let me know.

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[nickfloyd]

Hey @awedist Thank you for the changes here ❤️ . The SPDX format and the rigidity of how serialization has been implemented will make things a bit more challenging here. We'll need to look to see if the model properties can be annotated to cover the SBOM APIs - I'm pretty sure we could implement a custom naming strategy for the serializer to be able to use or add serializer options. We'd most likely have to modify the implementation in SimpleJson.cs.

I'll approve and merge this in as is and we can revisit the other API once we've taken some time to look.