Consolidate ref-related functionality into git-refs(1)

With Introduce a new command to work with refs (#317 - closed), we have introduced a new git-refs(1) commands. We should start to consolidate ref-related functionality into this command:

  # Replaces git-show-ref(1) and git-for-each-ref(1).
  $ git refs list

  # Replaces `git show-ref --exists`.
  $ git refs exist

  # Replaces `git show-ref --verify <ref>`.
  $ git refs show

  # Replaces git-symbolic-ref(1) to show a ref.
  $ git refs resolve

  # Replaces git-pack-ref(1).
  $ git refs pack

  # Replaces git-update-ref(1).
  $ git refs write

  # Replaces git-check-ref-format(1).
  $ git refs check-format