`but absorb` more detailed output

[schacon]

The but absorb command is pretty magical, it would be nice to have it describe exactly what it's deciding to do and why it's deciding to do it.

❯ but absorb

Found 6 changed files to absorb:

Absorbed to commit: af31a03 worktree change v1
  (last commit in the primary lane)

    x5 M Gemfile
    gd A app/controllers/bookmarks_controller.rb
    n4 A app/models/bookmark.rb

Absorbed to commit: 427019e feature work one
  (files locked to commit due to hunk range overlap)

    qa M app/models/user.rb
    hl A app/views/bookmarks/index.html.erb
    px M config/routes.rb

Hint: you can run `but undo` to undo these changes