2.1.0

feat: add startIcon property to CtaComponent

Add optional startIcon field to the CtaComponent class to support displaying icons on buttons. This backward-compatible enhancement allows specifying an icon identifier that will be displayed on the button.

Key changes:
- Add startIcon field as Optional<String> to CtaComponent
- Update constructor, builder methods, equals(), and hashCode() to include startIcon
- Add getter method with proper documentation
- Add builder methods for both Optional<String> and String variants

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