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ARROW-17462: [R] Cast scalars to type of field in Expression building (#13985)

Logic is encapsulated in `wrap_scalars()` in expression.R. Most test updating (that is not linting) is changing some printed output types because `int * 2` now stays `int32`, and the printed ExecPlans don't have as many `cast`s in them. The tests added in `test-dplyr-query.R` are the explicit tests of the feature. 

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>