[Bug #16465] [Bug #16801]
[Fix GH-2795] [Fix GH-2944] [Fix GH-3045] [Fix GH-3093]

Note: Backporting shouldn't modify object.h and instead can use
struct_new_kw which is basically a duplicate implementation of
rb_class_new_instance_pass_kw

Co-authored-by: Yusuke Endoh <mame@ruby-lang.org>
Co-authored-by: John Hawthorn <john@hawthorn.email>
Co-authored-by: Adam Hess <HParker@github.com>
Co-authored-by: Jose Cortinas <jacortinas@gmail.com>
Co-authored-by: Jean Boussier <jean.boussier@gmail.com>