Implement Datasource And PropertyListener

[gorexlv]

Issue Description

1. Implement DatasourceExtension and PropertyListener
2. Multiple configuration formats are supported

Type: feature request

Describe what feature you want

if possible, avoid passing interface{} in Rule converter function, same or like this:

// *_rule_manager.go
func Convert(data interface{}) error {
        config := data.([]byte)
        // convert config to FlowRule/SystemRule
}

which is not elegant and maybe not friendly for multiple configuration format.

Additional context

Add any other context or screenshots about the feature request here.

[gorexlv]

duplicated with #58

[louyuting]

duplicated with #58

Yes, I will close this issue.
We could discuss under #58
Discussion are welcomed.