Expose RepoUrl info in CommitInfo object

[Wauplin]

This small PR exposes repo_url info in the CommitInfo class. This will make it easier to retrieve the repo_id of a commit, typically when Model.push_to_hub creates the repo + create a commit and returns only the commit info and not the repo info (requested by @not-lain on Slack -internal- + makes sense to expose it).

Note: self.commit_url.split("/commit/")[0] is guaranteed to succeed given this (private repo), this and this are the only occurrences where the commit url is computed.

[HuggingFaceDocBuilderDev]

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[LysandreJik]

That would have been helpful for me once or twice in the past! Glad to see it being added.

LGTM

[Wauplin]

Thanks for the quick review! And yeah, agree with you it should have been there way earlier 😄