Commits on Mar 2, 2023

1. add -Zgitoxide=fetch feature toggle and implementation. …

   This allows to use `gitoxide` for all fetch operations, boosting performance
   for fetching the `crates.io` index by a factor of 2.2x, while being consistent
   on all platforms.
   
   For trying it, nightly builds of `cargo` can specify `-Zgitoxide=fetch`.
   It's also possible to set the `__CARGO_USE_GITOXIDE_INSTEAD_OF_GIT2=1` environment
   variable (value matters), which is when `-Zgitoxide=none` can be used
   to use `git2` instead.
   
   Limitations
   -----------
   Note that what follows are current shortcomings that will be addressed in future PRs.
   
   - it's likely that authentication around the `ssh` protocol will work differently in practice
     as it uses the `ssh` program.
   - clones from `file://` based crates indices will need the `git` binary to serve the locatl repository.
   - the progress bar shown when fetching doesn't work like the orgiinal, but should already feel 'faster'.

   

   Byron committed Mar 2, 2023
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