Org Chart/HR Portal grid sample implementation

[dkamburov]

Implement an Org Chart/HR Portal grid sample matching the design from HR Portal sample in webcomponents.

Design reference:

• Tree-grid for visualizing company hierarchical structure and employees' data (departments, teams, individual staff).
• Drill-down/expand to show levels, employee details, and org chart-like navigation.
• Features: inline expansion, dynamic data loading, filtering and sorting by employee properties, and collapsible nodes.
• Matching Fluent/Light theme for look and feel.
• Sample Design (WebComponents)

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• Theme: Fluent
• Mode: Light
• See also WebComponents repo for base implementation.