Add metadata per window

[yujonglee]

This should be done with our windows plugin.

• get_meta(webview)
• set_meta(webview, data)

This will allow us to remove main and sub query string from the app route.

[yujonglee]

maybe what we really need is some kind of properties, like

• show_left_sidebar
• show_search

[yujonglee]

import { getCurrentWebviewWindow } from "@tauri-apps/api/webviewWindow";

const TOOD = getCurrentWebviewWindow().label

[yujonglee]

closing this since we will just use getCurrentWebviewWindow().label and handle logic in the frontend.