[Doc] EventMesh application scenario case collection

[xwm1992]

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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
• ...

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[xwm1992]

• Application scenario name
  Data Steam Processing
• Application scenario description (relevant architecture diagram display)
  
  Based on the figure above, EventMesh is between customer data and target data sources, and can support streaming data processing. Through the filter\transformer capabilities of the EventMesh function, the data format and content desired by the customer can be processed and spit out to the target data source to achieve data cleaning, rule filtering, character replacement, data enrichment, data routing and other capabilities.
• Application scenario implementation proposal