Add more TiCDC usage documents

[amyangfei]

Feature Request

Describe the feature you'd like:

• 1. Add document about monitor metrics and alert items @overvenus P0
• 2. Add document about manual scheduling and scale-up procedure
• 3. Add document about table filter and changefeed config. Should pay attention to compatibility issue @overvenus ticdc: add doc about config docs-cn#3745
• 4. Add document about use TiCDC step by step P0
  • 4.1. Simple incremental replication case
  • 4.2. Full data export, import and then incremental replication case, such as dumpling + TiCDC
• 5. Add document about schema use scenario in Kafka sink. ref https://github.com/pingcap/ticdc/issues/626
• 6. Add document about DDL reentrant restrictions and DDL related operation. related issue: https://github.com/pingcap/ticdc/issues/625 @amyangfei Add more faqs in TiCDC docs-cn#3723
• 7. Add document about sink customization
• 8. Add document about cyclic replication (What it is and how to use.) @overvenus cdc: add cyclic replication doc docs-cn#3666
• 9. Add document about how to upgrade CDC
• 10. Add software and hardware recommendation @overvenus cdc: add software and hardware recommendation docs-cn#3676
• 11. Add document about timezone error. ref: Dynamic stream ticdc#165 @amyangfei Add more faqs in TiCDC docs-cn#3723
• 12. Add more details about changefeed information
• 13. Add FAQ about the problem: no data is replicated
• 14. Add document about the manual scheduling @leoppro P0
• 15. Add best practices about TiCDC usage scenario
• 16. Add document about common failure case using Kafka sink, including max.request.size etc. @overvenus ticdc: add more faq docs-cn#3882

[overvenus]

I take item 1 and item 8.

[amyangfei]

The document optimization will be tracked in other issue.