[Doc] EventMesh application scenario case collection

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no similar issues.

### Documentation Related

This issue is used to record and summarize the application scenarios of EventMesh.
Issues can be displayed according to the following parts(including but not limited to):
- Application scenario name
- Application scenario description (relevant architecture diagram display)
- Application scenario implementation proposal
- ...

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [ ] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) *

Start from the issue description and define the application scenarios to be collected. For each scenario, document its name, description with a relevant architecture diagram, and implementation proposal; done means the requested scenario collection is complete and organized in the project's documentation.

Written by the indexing model from the issue text.