Add tabbed inspector UI and attributes

Introduce tabbed inspector support: add runtime attributes (BeginTabGroupAttribute, TabAttribute, EndTabGroupAttribute and TabGroupVisual) and an editor drawer (BeginTabGroupAttributeDrawer) with responsive, styled tab rendering (Default/Flat/Segmented), tab state management and type/field discovery caching. Register new drawers in Editor Toolbox settings and add TabAttributeDrawer/EndTabGroup handling. Update example scene and SampleBehaviour4 to demonstrate tab groups and polish formatting. Also include small EditorUserSettings tweaks.

Author: MaykerStudio