replace vendored lazyeval with rlang

[maelle]

from #1419

[maelle]

.env is an obstacle at the moment.

[maelle]

lala = 1

pof <- function(x, ...) {
  rlang::eval_tidy(rlang::enquos(...)[[1]])
}

pof(x = 2, lala = rlang::.env$lala)
#> Error:
#> ! Can't subset `.data` outside of a data mask context.

^{Created on 2024-08-13 with reprex v2.1.0}