[Feature] Add support for window functions #460
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ANSI SQL2003 allows for a window_clause in aggregate function calls, the addition of which makes those functions into window functions. Nowadays, many mainstream relational databases, including MySQL, SQLite, Postgres, have supported window functions syntax. However, it is still rare to see an ORM framework that supports it. Ktorm, as a lightweight but powerful ORM framework, has the ability to be a pioneer.
This pull request mainly focuses on implementing window function expression for MySQL dialect.