docs(framework) Add how-to guide for using Flower Driver APIs

[chongshenng]

Issue

Description

Our Flower Driver APIs lack official feature documentation.

Related issues/PRs

Closely related to #3510 on How to use ClientApp guide.

Proposal

Explanation

Add a how-to guide highlighting the features of Flower Driver APIs.

Checklist

• [X] Implement proposed change
• ~~[ ] Write tests~~
• [X] Update documentation
• [X] Update the changelog entry below
• [x] Make CI checks pass

Changelog entry

Any other comments?

N/A