New functions to set and use context of window points (bug#33871)

New functions to set and use context of window points (bug#33871)

* lisp/dired.el (dired-mode): Set buffer-local
'window-point-context-set-function' to remember 'dired-filename'
or 'position' in the window with the Dired buffer.
Set buffer-local 'window-point-context-use-function' to restore
the remembered position of the window point.

* lisp/tab-bar.el (tab-bar--tab): Use window-point-context-set.
(tab-bar-select-restore-context): New user option.
(tab-bar-select-tab): Use window-point-context-use.

* lisp/window.el: Add '(context . writable)' to
'window-persistent-parameters'.
(window-point-context-set, window-point-context-use): New functions.
(window-point-context-set-default-function)
(window-point-context-use-default-function): New functions.
(window-point-context-set-function)
(window-point-context-use-function): New variables.