feat: adding enable (#2048)

* feat: adding enable

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* refactor: use recommended term

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* fix: use `cached_property` for `Options` properties

* fix: warn on PyPy default

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: mayeut <mayeut@users.noreply.github.com>

unit_test/main_tests/main_platform_test.py

@@ -6,6 +6,7 @@ import pytest
 
 from cibuildwheel.__main__ import main
 from cibuildwheel.architecture import Architecture
+from cibuildwheel.util import EnableGroups
 
 from ..conftest import MOCK_PACKAGE_DIR
 
@@ -216,7 +217,7 @@ def test_only_argument(intercepted_build_args, monkeypatch, only, plat):
     assert options.globals.build_selector.skip_config == ""
     assert options.platform == plat
     assert options.globals.architectures == Architecture.all_archs(plat)
-    assert options.globals.build_selector.prerelease_pythons is True
+    assert EnableGroups.PyPy in options.globals.build_selector.enable
 
 
 @pytest.mark.parametrize("only", ("cp311-manylxinux_x86_64", "some_linux_thing"))