[3.12] gh-115712: Support CSV dialects with delimiter=' ' and skipinitialspace=True (GH-115721) (GH-115729)

csv.writer() now quotes empty fields if delimiter is a space and
skipinitialspace is true and raises exception if quoting is not possible.
(cherry picked from commit 937d2821501de7adaa5ed8491eef4b7f3dc0940a)