feat(windows): add window_classname, closes #7498

allow to customize the window class name instead of current value hard coded "Window Class"

    * feat: add window_classname, closes #7498

    * add changes file

    * Update core/tauri-config-schema/schema.json

    * Update tooling/cli/schema.json

.changes/window-class-name.md

@@ -0,0 +1,8 @@
+---
+"tauri": 'minor:feat'
+"tauri-runtime-wry": 'minor:feat'
+"tauri-runtime": 'minor:feat'
+"tauri-utils": 'minor:feat'
+---
+
+Added the `window_classname` configuration option to `WindowBuilder`, `Window`, and `WindowConfig`. In order to set the name of the window class on Windows.