Kotlin snippets for Gemini Developer API

[cartland]

Kotlin snippets for this page: https://developer.android.com/ai/gemini/developer-api

[snippet-bot]

Here is the summary of changes.

You are about to add 13 region tags.

• gradle/libs.versions.toml:44, tag firebase_bom_version
• gradle/libs.versions.toml:180, tag firebase_bom_libraries
• misc/build.gradle.kts:76, tag firebase_ai_bom
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:33, tag firebase_ai_generative_backend_configuration
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:41, tag firebase_ai_generative_image_model_configuration
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:57, tag firebase_ai_text_only_input
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:66, tag firebase_ai_multimodal_input
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:84, tag firebase_ai_multimodal_audio_input
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:108, tag firebase_ai_multimodal_video_input
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:128, tag firebase_ai_multiturn_chat
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:144, tag firebase_ai_generate_image_from_text
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:159, tag firebase_ai_edit_image
• misc/src/main/java/com/example/snippets/ai/GenerativeAiSnippets.kt:176, tag firebase_ai_edit_image_chat

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[cartland]

Changes moved to #649