Added Multi-Selection to Media and Document Pickers

[fhasse95]

This PR demonstrates the multi-selection support of the media and document pickers in SkipKit by extending the existing DocumentPickerPlayground.

iOS:

Android:

Parent PR:

• Added Multi-Selection to Media and Document Pickers skip-kit#38

---

Thank you for contributing to the Skip project! Please use this space to describe your change and add any labels (bug, enhancement, documentation, etc.) to help categorize your contribution.

Please review the contribution guide at https://skip.dev/docs/contributing/ for advice and guidance on making high-quality PRs.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device

---

• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

The extended DocumentPickerPlayground has been created by Codex and manually tested on iOS and Android.

---