feat: add Greek keyboard support

[samarthshukla20]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

This pull request adds Greek keyboard support to Scribe Android.

The following changes were made:

• Added GREEK to ScribeLanguage
• Added GreekKeyboardIME
• Registered the Greek keyboard service in the Android manifest
• Added the Greek input method configuration
• Added Greek keyboard layouts for:
  • Standard phone layout
  • Tablet layout
  • Layout without period and comma

Testing

The application was built and run successfully through Android Studio and tested on an emulator.

The following functionality was verified:

• Greek keyboard loads correctly
• Greek characters can be typed
• Shift correctly switches between lowercase and uppercase characters
• Keyboard layouts work correctly

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Related issue

Closes #544

[Roniscend]

The lint/test checkbox wasn't checked off , verify that

[samarthshukla20]

Hey @Roniscend, Fixed the Kotlin lint issue in GreekKeyboardIME.kt and pushed the update. The contributor checklist has also been updated accordingly. The required checks now pass locally.