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Support isolated API instances #1925

@toddbaert

Description

@toddbaert

The spec now supports creating independent, non-singleton instances of the OpenFeature API. Each instance has its own providers, context, hooks, and events; totally separate from the global singleton and from each other. This is useful for things like micro-frontends, DI frameworks, and testing.

What needs to happen

  • Add a factory function (or equivalent) that creates new, independent API instances
  • Each instance should conform to the same API contract as the existing singleton
  • Ideally the factory lives in its own module/package for discoverability (recommended, not required)
  • A single provider instance shouldn't be bound to more than one API instance at a time

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