[AI] Add FirebaseAI.Instructions type with resultBuilder

[andrewheard]

Added a FirebaseAI.Instructions type with a Swift result builder. This enables trailing-closure syntax for specifying system instructions comprised of strings and structured data. For example:

let session = FirebaseAI.firebaseAI().generativeModelSession(
  model: .geminiModel(name: "gemini-3.5-flash")
) {
  "You are a weather bot that summarizes local weather conditions. Here is an example: "

  WeatherConditions(
    temperature: 25.0,
    conditions: "Sunny",
    summary: "A beautiful sunny day with a high of 25°C. Not a cloud in the sky."
  )

  "This is just an example, do not copy it."
}

The example weather conditions in the system instructions will be represented as JSON to help steer the model when generating structured outputs. FirebaseAI.Instructions are analogous to Instructions in the Foundation Models framework. When using hybrid inference, FirebaseAI.Instructions are converted to Instructions when starting the underlying LanguageModelSession.

#no-changelog

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[danger-firebase-ios]

	1 Warning
⚠️	New public headers were added, did you remember to add them to the umbrella header?

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