Separate flux component from flink component

[walterddr]

Currently the Flux topology definition makes use of the Flink's internal components (Source, Sink, Operator) as the main component derive.

This is problematic and violation of the DSL extensibility design: having the definition of the most basic component directly tight with the target language make it impossible to extend.

See how streamline differs these two [1][2] components.

Given that this is streamline UI derived (e.g. from json->flux), similar architecture should be provided in our case that goes from flux->flink

[walterddr]

close via #5 and #6