build: update minSdk to 23

[Myshkouski]

Resolves #222

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[gemini-code-assist]

Summary of Changes

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This pull request updates the minSdk version in the build.gradle.kts file and adds new dependencies related to UI tooling and previewing. This change ensures that the application targets a more recent Android API level and leverages the latest UI development tools.

Highlights

• Minimum SDK Version: The minimum SDK version was updated from 21 to 23.
• Dependencies: Added ui.tooling.preview and ui.tooling dependencies.

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[gemini-code-assist]

Code Review

This pull request updates the minSdk to 23 and adds dependencies for Jetpack Compose tooling. The changes themselves appear correct. I've added one minor suggestion to improve the readability of the Gradle build file by grouping dependency configurations. In the future, it would be beneficial to separate unrelated changes (like a minSdk update and adding new features/dependencies) into distinct pull requests for better clarity in the project's history.

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TvMaterialCatalog/app/build.gradle.kts (62-63)

For improved readability, it's a good practice to separate different dependency configurations (like implementation and debugImplementation) with a blank line. This helps in quickly distinguishing between different types of dependencies.

    implementation(libs.ui.tooling.preview)

    debugImplementation(libs.ui.tooling)

[pflammertsma]

@Myshkouski Thanks for your contribution! Please follow the steps to sign a Contributor License Agreement (CLA): https://github.com/android/tv-samples/pull/223/checks