Added snippets for Media3 Inspector module and update Media3 version to 1.9.0-alpha01

[amanc3765]

Added Kotlin and Java snippets for following classes in Media3 Inspector module:

- MetadataRetriever
- FrameExtractor
- MediaExtractorCompat

These snippets will be added to DAC in a separate CL.
Also bumped Media3 version to 1.9.0-alpha01 to use this new module.

[snippet-bot]

Here is the summary of changes.

You are about to add 14 region tags.

• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:57, tag android_dev_retriever_media3_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:85, tag android_migration_retriever_platform_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:98, tag android_migration_retriever_media3_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:127, tag android_dev_frame_media3_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:150, tag android_migration_frame_platform_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:166, tag android_migration_frame_media3_java
• misc/src/main/java/com/example/snippets/InspectorModuleJavaSnippets.java:189, tag android_dev_extractor_media3_java
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:43, tag android_dev_retriever_media3_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:61, tag android_migration_retriever_platform_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:76, tag android_migration_retriever_media3_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:97, tag android_dev_frame_media3_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:115, tag android_migration_frame_platform_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:137, tag android_migration_frame_media3_kotlin
• misc/src/main/java/com/example/snippets/InspectorModuleKotlinSnippets.kt:156, tag android_dev_extractor_media3_kotlin

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[MayuriKhinvasara]

LGTM. Just one minor change.

[MayuriKhinvasara]

nit: Add comment above the release statement