New treesit thing 'sexp-list' (bug#73404)

New treesit thing 'sexp-list' (bug#73404)

* lisp/treesit.el (treesit-forward-list): New command.
(treesit-forward-sexp): Check the thing 'text' only when
'treesit-sexp-type-regexp' is nil.
(treesit-forward-sexp-list): New function.
(treesit-navigate-thing): Don't try moving to parent
when thing is 'sexp-list'.
(treesit-major-mode-setup): Set 'forward-sexp-function' to
'treesit-forward-sexp-list' when the 'sexp-list' thing is defined.

(cherry picked from commit d930d7f8651897dc3130ff16731751691566d490)