Apheleia 1.0

Added

• Package apheleia
• Command apheleia-format-buffer
• User options:
  • apheleia-formatters, with supported formatters:
    • black
    • prettier
    • gofmt
    • terraform
  • apheleia-mode-alist
  • apheleia-post-format-hook
• Variable apheleia-formatter
• Minor mode apheleia-mode (and apheleia-global-mode)