feat: add tmux support

[mikesmithgh]

Testing with:
.tmux.conf

bind [ run-shell 'kitty @ kitten /Users/mike/gitrepos/kitty-scrollback.nvim/python/kitty_scrollback_nvim.py --env "TMUX=$TMUX" --env "TMUX_PANE=#{pane_id}"'

moved list to #115

• add tests checking env var and kitty_data.tmux
• add multipane test
• check positioning of paste window
  • status line impacts this, look into tmux set-option status on tmux set-option status 3 etc . check with tmux show-options status
  • adjust cursor pos for split panes (tmux display-message -p '#{cursor_x} #{cursor_y} #{pane_width} #{pane_height} #{window_visible_layout}')
  • idea, check if zoomed, if not toggle zoom before hand. tmux resize-pane -Z need to figure out command to check if already zoomed ( try #{window_zoomed_flag} )
• check positioning for scrolled window
• add command to generate config
• copy to clipboard, add/modify option to copy to tmux buffer with set-buffer command
• look into history-limit configuration and document preferred settings
• doc differences between tmux copy mode, e.g., one pane full screen instead of split panes
• if get-extent all, -S - -E -, if screen remove -S and -E options. see tmux capture-pane help
• review all options in capture-pane https://man7.org/linux/man-pages/man1/tmux.1.html

       capture-pane [-aAepPqCJN] [-b buffer-name] [-E end-line] [-S
               start-line] [-t target-pane]
                     (alias: capturep)
               Capture the contents of a pane.  If -p is given, the
               output goes to stdout, otherwise to the buffer specified
               with -b or a new buffer if omitted.  If -a is given, the
               alternate screen is used, and the history is not
               accessible.  If no alternate screen exists, an error will
               be returned unless -q is given.  If -e is given, the
               output includes escape sequences for text and background
               attributes.  -C also escapes non-printable characters as
               octal \xxx.  -T ignores trailing positions that do not
               contain a character.  -N preserves trailing spaces at
               each line's end and -J preserves trailing spaces and
               joins any wrapped lines; -J implies -T.  -P captures only
               any output that the pane has received that is the
               beginning of an as-yet incomplete escape sequence.

               -S and -E specify the starting and ending line numbers,
               zero is the first line of the visible pane and negative
               numbers are lines in the history.  ‘-’ to -S is the start
               of the history and to -E the end of the visible pane.
               The default is to capture only the visible contents of
               the pane.

• doc required tmux version
• nice to have? maybe? add tmux nerd font icon to status when in tmux mode
• doc doesn't work over ssh

[mikesmithgh]

🎉 This PR is included in version 4.1.0 🎉

The release is available on GitHub release

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