Integration section: catalog section and examples

[vordimous]

Implement the Integration section of the docs reorg https://docs.google.com/document/d/17a8RQJ3iqvSeeNdRFhT6E2GLWPEzc984Hw5FTnyBekc/edit#heading=h.fougv56onuc8

Integration How does Zilla leverage the resources I already have

• Detailed list of Supported Kafka brokers with testing results grid
• Describe Catalogs and any of the services used with them
• Message formats and validation (e.g., JSON, Avro)
• Data filtering on fetch based on schema fields
• Generic Examples
• Catalog validation cookbook guide
• add validation endpoints on the Quickstart