Adds a execute and return result message (#383)

* inital request

* refactored query execution failure callback to take exception

* added failure callback to execute and return

* added test for query execute and return

* updated params

* removed dead code

* addressed feedback; added multiple active result set support; updated tests

* addessed feedback and added testing and errors and verification

* change <= to ==

* changed name of trashQ to removedQuery

src/Microsoft.SqlTools.ServiceLayer/Localization/sr.strings

@@ -108,6 +108,10 @@ QueryServiceMessageSenderNotSql = Sender for OnInfoMessage event must be a SqlCo
 
 QueryServiceResultSetAddNoRows = Cannot add row to result buffer, data reader does not contain rows
 
+QueryServiceResultSetHasNoResults = Query has no results to return
+
+QueryServiceResultSetTooLarge = Result set has too many rows to be safely loaded
+
 ### Save As Requests
 
 QueryServiceSaveAsResultSetNotComplete = Result cannot be saved until query execution has completed