Add kitty external terminal support for macOS

[stefan-sedlak]

Implemented issue: #239470

Implementation includes:

• Detecting the presence of a running Kitty instance via its socket.
• Providing commands like "send-text" and "select-window" via the existing external terminal service or a new dedicated Kitty terminal service.
• Leveraging waiting loop to ensure the terminal socket is available before attempting to execute commands.
• Proper error messages when Kitty is not installed or fails to launch.

Existing test cases (related to macOS external terminal) are passing
No additional tests were added.

[stefan-sedlak]

@microsoft-github-policy-service agree

[stefan-sedlak]

Hi @meganrogge , @Tyriar ,
could you pease have a look on the commit and check if it requires changes?
Thx

[Fobnud-8wokpo-qivsyz]

Yo

[ZeckWork]

Up