[📑 Docs]: Normalize structure: Schema Evolution with Glue + MSK

[blkgrlcto]

What docs changes are you proposing?

Source: https://docs.localstack.cloud/aws/tutorials/schema-evolution-glue-msk/

What’s missing

• Intro
• Prerequisites
• Architecture diagram
• Steps
• Testing the application
• Conclusion

Proposed edits

• Add ## Testing the application consolidating verification steps (produce/consume, schema compatibility).

Acceptance criteria

• Dedicated Testing the application section with commands & expected results.

Code of Conduct

• I agree to follow this project's Code of Conduct

[sccalabr]

Id like to work on this