feat(windows): keyboard load blob

[rc-swag]

Fixes: #12500

[keymanapp-test-bot[bot]]

User Test Results

Test specification and instructions

ERROR: user tests have not yet been defined

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 - 18.0.138 (0.12684.12257)
• Keyboards
  • Test Keyboards
• Linux
  • Keyman for Linux: focal
  • Keyman for Linux: jammy
  • Keyman for Linux: noble
  • Keyman for Linux: oracular
• macOS
  • Keyman for macOS
• Web
  • KeymanWeb Test Home
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)