Feature Request: `str_squish` removes zero-width space

[ktomari]

I don't fully understand the ins-and-outs of Unicode, but I ran into some English text that has a zero-width space and I expected str_squish would remove it. It did not.

Example:

paste0("End of line has a zero-width space", 
         intToUtf8(x = 0x200B)) |>
  stringr::str_squish() |>
  stringr::str_detect("\u200B")

## [1] TRUE

Perhaps this should remove them by default, or have a parameter that optionally removes it (and other weird space-like characters).

Thank you for all your hard work!!