* lisp/tab-bar.el: Add tab-bar-history-mode with arrow buttons for navigation.

* lisp/tab-bar.el: Add tab-bar-history-mode with arrow buttons for navigation.

* lisp/tab-bar.el (tab-bar-back-button, tab-bar-forward-button):
New variables.
(tab-bar-make-keymap-1): Show these buttons in tab-bar-history-mode.
(tab-bar--tab): Add history-back and history-forward.
(tab-bar-select-tab): Restore history-back and history-forward.
(tab-bar-history-omit, tab-bar-history-back)
(tab-bar-history-forward, tab-bar-history-pre-change): New variables.
(tab-bar-history-pre-change, tab-bar-history-change)
(tab-bar-history-back, tab-bar-history-forward)
(tab-bar-history-mode): New functions.