two argument @funsql for query execution

[clarkevans]

The current @funsql builds a query object or defines a custom combinator. However, often you want to execute the query against a connection immediately. This would have a 2 argument version of funsql macro where the database is the 1st argument.

Here is an example of a single-argument version used to define a custom combinator.

@funsql count_records() = group().select(count())

The proposed two argument version would have the database as 1st argument.

@funsql eicu_db begin
    from(patient)
    count_records()
end