Rewrite emoji's usage of transient

Rewrite emoji's usage of transient

* lisp/international/emoji.el:
(emoji--done-derived): Remove variable.
(emoji-insert, emoji-recent, emoji-search, emoji-list-select):
Define using 'transient-define-prefix'.  Use a base suffix group
whose value is calculated dynamically.
(emoji--setup-prefix, emoji--setup-suffixes, emoji-group-description):
New functions used to dynamically calculate suffixes.
(emoji--narrow): New suffix class, used to pass state to recursive,
narrowed invocations of the prefix command the user initially invoked.
(emoji-insert-glyph): New suffix command that is used for all glyphs
that have no derivations.  Previously a separate command was define
for each glyph.
(emoji--fontify-glyph): Replace 'inhibit-derived' argument with
'done-derived' argument.
(emoji--define-transient): Remove function.
(emoji--layout): New function, replacing 'emoji--define-transient'.
Return the suffixes in 'define-transient-prefix' format.  Unlike
the replaced function, do not define any new commands, instead use
either the current prefix command or 'emoji-insert-glyph'.
(emoji--recent-transient): Remove function.
(emoji--char-sequence): New function.
(emoji--add-recent): Remove all text properties from glyph.
(emoji--choose-emoji): Remove function.