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Support window functions with empty OVER clause #298

Description

@Dandandan

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Window functions are a very valuable feature to have for DataFusion, as it allows to do analytical queries and things like deduplication to happen.

Describe the solution you'd like
Initial support for window functions with OVER () clause. This allows us to gradually add more features, like support for PARTITION BY and ORDER BY.

Describe alternatives you've considered
A more complete implementation in one go. Window functions however are a big feature and we probably need quite some iterations to get it in shape.

Additional context
Some material:
http://www.vldb.org/pvldb/vol8/p1058-leis.pdf&ved=2ahUKEwj80-3OjrfwAhUJPOwKHfdRAssQFjAMegQIEhAC&usg=AOvVaw2KKUPeYhyc-pEFTmlqyboj

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