Add availability annotations

Author: andrewheard

FirebaseAI/Sources/TemplateInput.swift

@@ -14,6 +14,7 @@
 
 import Foundation
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public struct TemplateInput: Sendable {
   let value: JSONValue
 
@@ -26,6 +27,7 @@ public struct TemplateInput: Sendable {
   }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension TemplateInput: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput { self }
 }

FirebaseAI/Sources/Types/Public/TemplateInputRepresentable.swift

@@ -15,40 +15,48 @@
 import Foundation
 
 /// A type that can be represented as a ``TemplateInput``.
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public protocol TemplateInputRepresentable: Encodable, Sendable {
   var templateInputRepresentation: TemplateInput { get }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension String: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput { TemplateInput(value: .string(self)) }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Int: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput {
     TemplateInput(value: .number(Double(self)))
   }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Double: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput { TemplateInput(value: .number(self)) }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Float: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput {
     TemplateInput(value: .number(Double(self)))
   }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Bool: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput { TemplateInput(value: .bool(self)) }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Array: TemplateInputRepresentable where Element: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput {
     TemplateInput(value: .array(map { TemplateInput($0).value }))
   }
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 extension Dictionary: TemplateInputRepresentable
   where Key == String, Value: TemplateInputRepresentable {
   public var templateInputRepresentation: TemplateInput {