[3.13] gh-135661: Fix CDATA section parsing in HTMLParser (GH-135665) (GH-137773)

"] ]>" and "]] >" no longer end the CDATA section.

Make CDATA section parsing  context depending.
Add private method HTMLParser._set_support_cdata() to change the context.
If called with True, "<[CDATA[" starts a CDATA section which ends with "]]>".
If called with False, "<[CDATA[" starts a bogus comments which ends with ">".
(cherry picked from commit 0cbbfc462119b9107b373c24d2bda5a1271bed36)

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