This commit introduces generateSetClassMetadataCall(), an API in ngtsc for generating calls to setClassMetadata() for a given declaration. The reflection API is used to enumerate Angular decorators on the declaration, which are converted to a format that ReflectionCapabilities can understand. The reflection metadata is then patched onto the declared type via a call to setClassMetadata(). This is simply a utility, a future commit invokes this utility for each DecoratorHandler. Testing strategy: tests are included which exercise generateSetClassMetadata in isolation. PR Close #26860
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