feat(vapor): defineVaporAsyncComponent

[edison1105]

• Added defineVaporAsyncComponent API
• Extracted shared logic from apiAsyncComponent.ts by creating createAsyncComponentContext and useAsyncComponentState utility functions, shared between core and vapor
• Added support for template ref forwarding
• Ported all test cases from apiAsyncComponent.spec.ts except Suspense and KeepAlive related ones

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commit: 307f757