Adding iOS 15/macOS 12+ annotations for onStoreDidLoad functions

Author: mergesort

Sources/Boutique/Store+Observation.swift

@@ -1,6 +1,7 @@
 import SwiftUI
 
 public extension View {
+    @available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *)
     func onStoreDidLoad<StorableItem: Codable & Sendable>(_ store: Store<StorableItem>, onLoad: @escaping () -> Void, onError: ((Error) -> Void)? = nil) -> some View {
         self.task({
             do {
@@ -12,6 +13,7 @@ public extension View {
         })
     }
 
+    @available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *)
     func onStoreDidLoad<StorableItem: Codable & Sendable>(_ store: Store<StorableItem>, update hasLoadedState: Binding<Bool>, onError: ((Error) -> Void)? = nil) -> some View {
         self.task({
             do {