[sql] Added preliminary implementation of SQLSchemaInspector
[sql] Added preliminary implementation of SQLSchemaInspector

SQLSchemaInspector helps with automatic discovery of fact and dimension
tables

pombredanne/cubes,cesarmarinhorj/cubes,pombredanne/cubes,pombredanne/cubes,jell0720/cubes,jell0720/cubes,noyeitan/cubes,ubreddy/cubes,zejn/cubes,ubreddy/cubes,zejn/cubes,noyeitan/cubes,noyeitan/cubes,zejn/cubes,jell0720/cubes,cesarmarinhorj/cubes,cesarmarinhorj/cubes,ubreddy/cubes