libstdc++: Add P1206R7 from_range members to std::list and std::forward_list [PR111055]

libstdc++: Add P1206R7 from_range members to std::list and std::forward_list [PR111055]

This is another piece of P1206R7, adding new members to std::list and
std::forward_list.

libstdc++-v3/ChangeLog:

	PR libstdc++/111055
	* include/bits/forward_list.h
	(forward_list(from_range, R&&, const Alloc&), assign_range)
	(prepend_range, insert_range_after): Define.
	* include/bits/stl_list.h (list(from_range, R&&, const Alloc&))
	(assign_range, prepend_range, append_range, insert_range):
	Define.
	* include/debug/forward_list
	(forward_list(from_range, R&&, const Alloc&), assign_range)
	(prepend_range, insert_range_after): Define.
	* include/debug/list (list(from_range, R&&, const Alloc&))
	(assign_range, prepend_range, append_range, insert_range):
	Define.
	* testsuite/23_containers/forward_list/cons/from_range.cc: New
	test.
	* testsuite/23_containers/forward_list/modifiers/assign_range.cc:
	New test.
	* testsuite/23_containers/forward_list/modifiers/insert_range_after.cc:
	New test.
	* testsuite/23_containers/forward_list/modifiers/prepend_range.cc:
	New test.
	* testsuite/23_containers/list/cons/from_range.cc: New test.
	* testsuite/23_containers/list/modifiers/append_range.cc: New
	test.
	* testsuite/23_containers/list/modifiers/assign/assign_range.cc:
	New test.
	* testsuite/23_containers/list/modifiers/insert/insert_range.cc:
	New test.
	* testsuite/23_containers/list/modifiers/prepend_range.cc: New
	test.

Reviewed-by: Patrick Palka <ppalka@redhat.com>