Add Camera2 to CameraX migration snippets

[madebymozart]

Added Camera2 to CameraX Snippets for migration

[snippet-bot]

Here is the summary of changes.

You are about to add 8 region tags.

• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:47, tag android_camerax_initialize_provider_camera2
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:86, tag android_camerax_view_preview_camera2
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:93, tag android_camerax_compose_preview_camera2
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:104, tag android_camerax_capture_photo_camera2
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:138, tag android_camerax_image_analysis
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:154, tag android_camerax_camera2_interop
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:168, tag android_camerax_dependencies_toml_c2
• camerax/src/main/java/com/example/camerax/snippets/Camera2ToCameraXSnippets.kt:184, tag android_camerax_dependencies_kts_c2

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[gemini-code-assist]

Code Review

This pull request introduces Camera2 to CameraX migration snippets, covering initialization, previewing, capturing, image analysis, and interop, along with build configuration snippets. The review feedback highlights critical improvements: handling potential null values from BitmapFactory.decodeByteArray to prevent a NullPointerException, wrapping image analysis in a try-finally block to guarantee imageProxy.close() is called even if an exception occurs, and correcting comment syntax in the TOML dependency snippet from // to #.

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