Expose Windows IME status to terminal applications

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### Description of the new feature

I use Windows Terminal with WSL2, and sometimes terminal applications need to know the current Windows IME status.

I had this problem with Neovim before, so I made a small CLI tool called winime_en:

https://github.com/hdformat/winime_en

It switches the Windows IME to English, and I use it from Neovim running inside WSL. I made this because Korean input is inconvenient when entering Normal mode.

Recently I had a similar problem with Herdr. Herdr has a prefix mode like tmux, and the prefix commands need English input. But an application running inside WSL does not have a simple way to know the current Windows IME status.

I think it would be useful if Windows Terminal exposes the IME status to programs running inside the terminal.

For example:

wt.exe --ime-status --format json

Example output:

{
"language": "ko-KR",
"mode": "hangul"
}

or:

{
"language": "ko-KR",
"mode": "ascii"
}

The command and JSON format are only examples. I don't know what is the best interface for Windows Terminal.

This could be useful for Neovim, tmux, Herdr, and other terminal programs, especially when they are running inside WSL.

I found #19491, which suggests showing the IME status by changing the cursor color. I think exposing the same information to terminal applications could also be useful.

### Proposed technical implementation details

I am not sure about the implementation.

Maybe Windows Terminal can expose the current IME status through a CLI command, environment/session interface, or some other machine-readable interface that can also be accessed from WSL.

Inizia esaminando lo strumento winime_en esistente e l’issue #19491 per comprendere le informazioni IME richieste e il comportamento correlato del terminale. Definisci un’interfaccia leggibile dalle macchine a cui possano accedere le applicazioni in esecuzione all’interno di WSL, quindi verifica che le applicazioni del terminale possano recuperare in modo affidabile la lingua e la modalità di input correnti.

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