Issue #3508054 by christian.wiedemann, just_like_good_vibes: [2.0.x] Widget Settings

src/Plugin/UiPatterns/Source/AttributesWidget.php

src/Plugin/UiPatterns/Source/CheckboxWidget.php

src/Plugin/UiPatterns/Source/CheckboxesWidget.php

src/Plugin/UiPatterns/Source/NumberWidget.php

src/Plugin/UiPatterns/Source/SelectWidget.php

src/Plugin/UiPatterns/Source/SelectsWidget.php

src/Plugin/UiPatterns/Source/TextfieldWidget.php

src/Plugin/UiPatterns/Source/UrlWidget.php

src/PluginWidgetSettingsInterface.php

src/SourcePluginBase.php

src/SourcePluginPropValueWidget.php

src/WidgetSettingTrait.php

tests/src/Kernel/WidgetSettingTest.php