Manager provide an openapi of DataProxy configuration data for multi-subcluster

[luchunliang]

Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
OpenApi of DataProxy configuration data is about the configuration data of middleware, flume source, flume sink, topic.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

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