Add build workflows for Android sample apps

[cartland]

This commit adds new GitHub Actions workflows to build the following Android sample applications:

• AutofillFramework
• BasicGestureDetect
• CommitContentSampleApp

These workflows are triggered on push, pull request, and workflow_dispatch events, and they build the debug APK for each application.

[gemini-code-assist[bot]]

[!NOTE] The files in this pull request are not supported by Gemini Code Assist.