Add Storage Access Framework demos

[yrezgui]

Migrating and updating storage access framework demos from https://github.com/android/storage-samples

[madebymozart]

feel free to rebase or merge this as the build issues should be fixed

[yrezgui]

/gemini summarize

[gemini-code-assist]

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[Waham2000]

https://githubstatus.com

[alabiaga]

This change is causing android manifest merge issues

Error:
uses-sdk:minSdkVersion 21 cannot be smaller than version 34 declared in library [androidx.photopicker:photopicker-compose:1.0.0-alpha01] /Users/alabiaga/.gradle/caches/8.11.1/transforms/247fc706c8a03340f7e50727e73cc0f7/transformed/photopicker-compose-1.0.0-alpha01/AndroidManifest.xml as the library might be using APIs not available in 21
Suggestion: use a compatible library with a minSdk of at most 21,
or increase this project's minSdk version to at least 34,
or use tools:overrideLibrary="androidx.photopicker.compose" to force usage (may lead to runtime failures)

The minSdk version supported for the photopicker lib is 34, should we bump the whole app to that version?