Support ADL Analytics as data source

This is like a two distinct requrirement but are corelated to each other. In addition to U-SQL supporting only outputting data into files through batch execution. Also enable interactive query capability that delivers results back to the client and w/o landing it into ADLS. In addition, PowerBI must be able to connect ADLA and can issue different queries while interactive ADLA performs necessary computation and delivers results of such computation back to the reporting and BI tools.