`relocate()` drops attributes attached to bare data frames

[DavisVaughan]

Since this is mainly just using x[i] it should be using dplyr_col_select() internally, which patches the [ method of base R data frames and data.table objects to retain attributes

library(dplyr)

df <- vctrs::data_frame(x = 1, y = 2)
attr(df, "foo") <- "bar"

out <- relocate(df, y, .before = x)

attr(out, "foo")
#> NULL

Since mutate() also uses relocate(), that should fix the same kind of issue that comes from mutate() + .before

library(dplyr)

df <- vctrs::data_frame(x = 1, y = 2)
attr(df, "foo") <- "bar"

out <- mutate(df, z = 3, .before = x)

attr(out, "foo")
#> NULL