change(ios): set host-app bundle identifier in embedded Web debug-report

[jahorton]

In our current Sentry reports coming from within the iOS app's keyboard host-page, we get the following under keymanState:

{
  configReport: {
  embeddingApp: AppleTablet,
  hostDevice: {
    browser: native,
    formFactor: tablet,
    OS: ios,
    touchable: true
  },
  initialized: true,
  keymanEngine: app/webview
}

It is certainly helpful to know that the error occurred with the app/webview build on an Apple tablet - that tells us it's from some variant of our iOS engine. But... which one? This PR fetches the active bundle identifier and ferries that into the Web engine once it loads, which will allow us to have the actual active identifier.

• Is it the Keyman app? Tavultesoft.Keyman.
• Is it the app's system keyboard? Tavultesoft.Keyman.SWKeyboard
• Is it coming from a different app that's embedding KeymanEngine? We'll get that identifier here.

I decided to pursue this due to some questions I had after investigation into #13102; namely, we've noticed in the past that users of the FirstVoices app often decide not to utilize sil_euro_latin, which is our engine's default keyboard. There's a chance that #13102 is related to side effects that result when users enforce this preference.

@keymanapp-test-bot skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

Test Artifacts

• Android
  • Keyman for Android apk
  • FirstVoices for Android 16.0 apk
  • FirstVoices Keyboards for Android apk
  • KeyboardHarness apk
  • Keyman for Android 16.0 apk
  • KMSample1 apk
  • KMSample2 apk
• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• iOS
  • Keyman for iOS (simulator image)
  • FirstVoices Keyboards for iOS (simulator image)
  • TestFlight internal PR build version - 18.0.182 (0.13105.12769)
• Keyboards
  • Test Keyboards
• Web
  • KeymanWeb Test Home
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)