git: option to use difftastic as difftool (not main diff)

[tennox]

Description

I want git diff to stay the same, but git difftool to use difftastic, as described in the difftastic docs: https://difftastic.wilfred.me.uk/git.html#regular-usage

Checklist

• [x] Change is backwards compatible.

• [x] Code formatted with ./format.

• [x] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• [ ] Test cases updated/added. See example.

• [x] Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • [ ] Added myself as module maintainer. See example.

Maintainer CC

@rycee