DRILL-1460: Implement "read_numbers_as_double" option for JSON reader
Conflicts:
contrib/storage-mongo/src/main/java/org/apache/drill/exec/store/mongo/MongoRecordReader.java
exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/conv/JsonConvertFrom.java
exec/java-exec/src/main/java/org/apache/drill/exec/server/options/SystemOptionManager.java
exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/json/JSONRecordReader.java
exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/fn/JsonReader.java
Conflicts:
exec/java-exec/src/main/java/org/apache/drill/exec/vector/complex/fn/JsonReader.java
exec/java-exec/src/test/java/org/apache/drill/exec/store/json/TestJsonRecordReader.java
