CadmusJiang

Go1.16 compilation failed

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The PingCAP company is upgrading the go version from 1.13 to 1.16. Is this a compilation error caused by go version? go1.13  go1.15  go1.16 

## Development Task Allow users to modify topology.yaml in order to scale-in/out TiFlash and CDC.

## Development Task  PD doesn't know they are on the same machine, so we need to label the machine. The method of tiup is as follows: https://docs.pingcap.com/zh/tidb/stable/schedule-replicas-by-topology-labels

## Development Task modify testclustertopology_types.go TestClusterTopology, add message in status.state

feature: add filter

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Signed-off-by: Cadmus ### What problem does this PR solve? Issue Number: close #xxx Problem Summary: filter content between \`\`\` \`\`\` ### What is changed and how it works? What's Changed:...

Refactor/delete function

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: delete fucntion(add first-time-contributor label and notice reviewer) ### What is changed and how it works? What's Changed:...