[AI] Add overloads supporting FoundationModels.Generable

[andrewheard]

WIP

• Renamed macros to @Generable and @Guide.
• Renamed generated struct to PartiallyGenerable.
• Relaxed the constraint on the associated type for PartiallyGenerated from ConvertibleFromFirebaseGeneratedContent to SendableMetatype.
  • This allows us to check if PartiallyGenerated conforms to ConvertibleFromFirebaseGeneratedContent or FoundationModels.ConvertibleFromGeneratedContent at runtime in order to support generating FoundationModels.Generable types.
  • This allows devs to use the Foundation Models @Generable macro if needed (such as the zip distribution).
• Added overloads in GenerativeModel for streamResponse(to:generating:) that support FoundationModels.Generable types.
  • TODO: Do the same for respond(to:generating).

#no-changelog

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