Support CWD notifications in kitty

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Description

For upcoming SSH integration related features, kitty started to support parsing the current working directory from OSC 7.

In addition to the file:// escaped URL format, it also supports kitty-shell-cwd://$hostname$PWD, which does not require URL escaping.

https://github.com/kovidgoyal/kitty/blob/a834f221f1e289fc9da47a3c8eb97e013537e413/kitty/utils.py#L941-L947

To allow fish 3.2.0+ to report CWD as well, the following code was added to kitty's shell integration. Please feel free to point out if there is anything wrong with it.

https://github.com/kovidgoyal/kitty/blob/7160027c14437f4f387ee1a310024ce139199976/shell-integration/fish/vendor_conf.d/kitty-shell-integration.fish#L98-L108

# Enable CWD reporting
if not contains "no-cwd" $_ksi
    # This function name is from fish and will override the builtin one if fish enabled this feature by default.
    # We provide this to ensure that fish 3.2.0 and above will work.
    # https://github.com/fish-shell/fish-shell/blob/3.2.0/share/functions/__fish_config_interactive.fish#L275
    function __update_cwd_osc --on-variable PWD -d "Report PWD changes to kitty"
        status is-command-substitution
        or echo -en "\e]7;kitty-shell-cwd://$hostname$PWD\a"
    end
    __update_cwd_osc
end

Are we allowed to add kitty cwd format? Maybe that would improve performance.

TODOs:

• Changes to fish usage are reflected in user documentation/manpages.
• Tests have been added for regressions fixed
• User-visible changes noted in CHANGELOG.rst

[faho]

Are we allowed to add kitty cwd format? Maybe that would improve performance.

CWD reporting isn't a slowdown, at all.

string escape --style=url $PWD takes ~20 microseconds on my system. So no, I see no reason to add the special kitty version.

I will however merge the ordinary version. Thanks!