[3.11] gh-115712: Support CSV dialects with delimiter=' ' and skipinitialspace=True (GH-115721) (GH-115729) (GH-115738)

(cherry picked from commit 5ea86f496a4cfb34abbe2b7bb6fa7f25eeeb6294)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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)