Avoid slow remote file name completion annotations

Avoid slow remote file name completion annotations

* lisp/files.el (file-name-attributes-completion-annotation)
(file-name-completion-annotation): New function.
* lisp/minibuffer.el (completion-file-name-affixation): Use it.

* lisp/net/tramp-sudoedit.el (tramp-sudoedit-file-name-handler-alist)
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist): Register
handler function for 'file-name-completion-annotation'.
(tramp-sh-handle-file-name-completion-annotation)
* lisp/net/tramp.el (tramp-file-name-for-operation): Handle it.

* doc/lispref/files.texi (File Attributes)
(Magic File Names): Document 'file-name-completion-annotation'.

* etc/NEWS: Announce it.