Implement @Interface and @compose decorators
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The `@compose` decorator is used to indicate that a GraphQL `type` or `interface` implements one or more interfaces. As [defined by the GraphQL spec](https://spec.graphql.org/October2021/#sec-Interfaces), a `type` or `interface` implementing an interface must contain all the properties defined by that interface, and so we require that the TypeSpec model implement the interface's properties as well. There is no restriction on how this is accomplished (via spread, via composition, via manual copying of properties, etc). To reduce confusion, we do not allow a TypeSpec model to define both a `type` and an `interface`. In order to define an `interface`, the model must be decorated with the `@Interface` decorator.
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The
@composedecorator is used to indicate that a GraphQLtypeorinterfaceimplements one or more interfaces.As defined by the GraphQL spec, a
typeorinterfaceimplementing an interface must contain all the properties defined by that interface, and so we require that the TypeSpec model implement the interface's properties as well. There is no restriction on how this is accomplished (via spread, via composition, via manual copying of properties, etc).To reduce confusion, we do not allow a TypeSpec model to define both a
typeand aninterface. In order to define aninterface, the model must be decorated with the@Interfacedecorator.