Add DirectQuery functionality to Sybase databases

[gints_lazdins]

DirectQuery functionality is needed for handling large data sets for reporting when end-user is choosing which part of this data set should be presented in Power BI report/dashboard (like some particular user report from million of users). As many large/medium size organisation are using Sybase to store it's data, it would be very useful to expand DirectQuery functionality to Sybase and expand Power BI usage opportunity for companies with Sybase infrastructure.