[Firebase AI] Add macro support for enums with raw values

[andrewheard]

This extends #15768 to add support for Swift enums that have String raw values, e.g.:

@FirebaseGenerable
enum Priority: String {
  case high
  case medium = "med"
  case low
}

These now use the rawValue for the case name in the generated JSON Schema.

#no-changelog

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[gemini-code-assist]

Code Review

This pull request extends the @FirebaseGenerable macro to support Swift enums with String raw values, which is a great addition. The changes correctly handle the generation of the initializer, JSON schema, and model output for these enums. The accompanying unit and integration tests are thorough and cover the new functionality well. I have a couple of suggestions to improve code maintainability by reducing some code duplication within the macro's implementation.

[gemini-code-assist]

Code Review

This pull request extends the @FirebaseGenerable macro to support Swift enums that have String raw values. The implementation correctly distinguishes between string-backed enums and simple enums, using the appropriate initialization strategy for each. The changes are well-structured and accompanied by comprehensive unit and integration tests, ensuring the new functionality is robust. I have one minor suggestion to simplify a piece of logic in the macro expansion, but overall this is a great addition.

[paulb777]

❤️