Autocomplete table/column names in SQL editors

- In DB and Table level SQL editors, console
- Updated CodeMirror addon `sql-hint.js` to newer version

Signed-off-by: Nisarg Jhaveri <nisarg.jhaveri@research.iiit.ac.in>
Merge pull request #1377 from nisargjhaveri/autocomplete

Autocomplete table/column names in SQL editors