Add prog-fill-reindent-defun (bug#59664)

Add prog-fill-reindent-defun (bug#59664)

Introduce a new command that aims to reindent code in a defun, or fill
a paragraph of text.  The command uses treesit.el when available,
otherwise falls back to using syntax-ppss and regexps.  Treesit.el
needs a new variable that is intended to be set by the major modes so
that this and other future functions can know what kind of node we are
looking at.

* doc/emacs/programs.texi: Mention the new command.
* etc/NEWS: Mention the new command.
* lisp/progmodes/c-ts-mode.el (c++-ts-mode): Add regexp for the new
variable.
* lisp/progmodes/csharp-mode.el (csharp-ts-mode): Add regexp for the
new variable.
* lisp/progmodes/java-ts-mode.el (java-ts-mode): Add regexp for the
new variable.
* lisp/progmodes/js.el (js-ts-mode): Add regexp for the new variable.
* list/progmodes/prog-mode.el (prog-mode-map): Bind the new command by
default.
(prog-fill-reindent-defun): New command.
* lisp/progmodes/sh-script.el (bash-ts-mode): Add regexp for the new
variable.
* lisp/progmodes/typescript-ts-mode.el (typescript-ts-base-mode): Add
regexp for the new variable.
* lisp/treesit.el (treesit-text-type-regexp): New variable.