tidyverse/duckplyr

Investigate constant folding

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For the purposes of duckplyr, every call that does not contain a column reference can be evaluated up front, in the environment of the quosure. The tests and revdepchecks will tell us if this works well enough. This is already done for %in% .

When doing that, we can also collect the columns actually used by a transformation, for #162.

Duplicate of #180.