Tracking issue for oxidizing (using `gitoxide` instead of `git2`)

[cruessler]

This is a tracking issue for oxidizing gitui. I’ve only collected the areas that already have at least one PR. I want to add more context and details over time. I hope I didn’t miss any existing tracking issue on the same topic. 😄

High-level

• status
  • tree view (Use gitoxide in get_status #2673)
  • diff view (Use gitoxide in get_diff #2685)
• tags (Use gitoxide for get_tags #2664)
• branches (Use gitoxide for get_branches_info #2706)
• blame (Draft PoC of blame using gitoxide #2591)
• log view without filter (Add LogWalkerWithoutFilter, using gitoxide #2275)
• log view with filter

Low-level

• get_commit_info (Use gitoxide in get_commit_info #2654)

Clean-up/refactor

Some of the following refactorings might not be possible yet, but depend on other work to be finished before we can start working on them.

• extract function gix_repo(), similar to repo(), that wraps current gix::ThreadSafeRepository::discover_with_environment_overrides(repo_path.gitpath()).map(Into::into)?
• either remove untracked_files_config_repo in case it is not needed anymore or change it to match git behaviour
• extract gitoxide-related errors into a separate error variant GixError to keep them in a single place (Extract GixError #2687)