CREATE / DROP VIEW queries support (#656)

* CREATE / DROP VIEW queries support

SELECTing from VIEWs is not supported yet!

- Make changes to the YQL grammar to add CREATE / DROP VIEW statements
- Save the query text specified in the CREATE VIEW statement in the VIEW object
- Implement VIEW as a wrapped generic Object: CREATE / DROP VIEW
commands call Create/DropObject commands with appropriate settings
- Query text is stored in the object's features

* Implement placeholder intent determination transformer for CreateObject to allow type annotation of the select statement saved inside a VIEW in CREATE VIEW statement

Saving parsed AST of the view can be used to find type errors in the select statement saved inside a VIEW during validation stage of the YQL pipeline. It seems to necessitate adding this placeholder implementation of the CreateObject handler

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