feat: added first typescript support

Didn't add many types yet. Just used to test out typescript compiler, copying files and building.
Now that all that seems to go well I can start converting all files to .ts and then adding proper typing everywhere

src/constants/settings.js

@@ -21,6 +21,7 @@ const settings = {
   enableCustomHotkeys: "enableCustomHotkeys",
   enableDiscord: "enableDiscord",
   flags: {
+    root: "flags",
     disableHardwareMediaKeys: "flags.disableHardwareMediaKeys",
     gpuRasterization: "flags.gpuRasterization",
   },