TiCDC owner availability check

[amyangfei]

Is your feature request related to a problem?

Such as https://github.com/pingcap/ticdc/issues/3352 and https://github.com/pingcap/ticdc/issues/3331, ticdc owner could be stuck and the whole TiCDC cluster will be abnormal. Note the owner may be fallen into some long time wait condition, including IO wait, some logic wait condition etc, instead of etcd session lost.

Describe the feature you'd like

Add a background goroutine to detect the availability of cdc owner, it can check either the metric counter of ticdc_owner_ownership_counter or something else, to ensure TiCDC owner works well. If the checker finds TiCDC owner is not available, it could do following things

• Dump the goroutine of TiCDC owner node
• Provide some mechanism to evicit TiCDC owner.

Describe alternatives you've considered

No response

Teachability, Documentation, Adoption, Migration Strategy

No response