Add clear rep information to st object

See the clear_reps argument passed to stable() and then to tab_clear_reps().

st_clear_reps(x, ..., .now = FALSE)

st_clear_grouped(x, ...)

Arguments

x	an stobject
...	quoted or unquoted column names passed to stable() as clear_reps
.now	if TRUE, the data is immediately processed; otherwise, the processing is done after the pipeline completes