feat: Add React interop adapter

[TudorGR]

Implements WrapForReact() to enable seamless use of Rimmel components inside React applications.

Features:

• Converts React props to BehaviorSubject observables
• Maintains Rimmel's no-re-render reactive model
• Proper lifecycle management and cleanup
• React as optional peer dependency (zero bloat for non-React users)

Usage:

const ReactCounter = WrapForReact(RimmelComponent);
<ReactCounter externalCounter={reactState} />

Example included at react-interop demonstrating bidirectional reactivity.

Closes #71