Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Create `pijul-repository` crate

I expect this to be the single most useful crate for integrations, but there is still a lot of polish (docs, refactoring etc) needed before publishing. Even in its current state, having a common, public interface for interacting with Pijul repositories should be a major asset.

Created by  finchie  on July 14, 2023
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