Add Angular wrappers and tests for ok-components fv directives

[fredvisser]

Summary

Add Angular directive wrappers (ok-angular/fv/) for 9 ok-components FV web components, with comprehensive tests.

Components wrapped

• ok-fv-accordion-item
• ok-fv-card
• ok-fv-chip-selector
• ok-fv-context-help
• ok-fv-search-input
• ok-fv-split-button
• ok-fv-split-button-anchor
• ok-fv-summary-panel
• ok-fv-summary-panel-tile

What's included

• Angular directives mapping all public @attr properties (no @internal properties exposed)
• NgModules with web component registration side-effect imports
• Tests covering:
  • Custom element registration
  • Default values
  • Template string attribute binding
  • Property binding with change detection