Feature Request

Is your feature request related to a problem? Please describe:

After this issue(#768), the parser supports set config name=value syntax, but the name doesn't support using -.
We should support it since there are some config items like label-property.reject-leader, auto-compaction which use - in their names.

Describe the feature you'd like:

Support using dash(-) in config item names, for examples:

1. set config pd auto-compation=true
2. set config pd property.reject-leader.key='zone'

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: