HUE-1889 [beeswax] Slickier editor UX

Merged DB dropdown into the Navigator tab
Moved Navigator to the left side and expanded the query area
Added recent queries
Added resize handle
[beeswax] Allow saving results to fully-qualified name database
HUE-1939 [beeswax] CTAS redirects to the default database in the metastore

Support saving all the CTAS use cases, e.g.
  - from current DB to current DB
  - from current DB to another DB
  - from DBA to current DB
  - from DBA.TABLE1 to DBB.TABLE2