feat: create LegacyTabView implementation

Author: 47PADO47

packages/react-native-bottom-tabs/ios/TabView/LegacyTabView.swift

@@ -0,0 +1,64 @@
+import SwiftUI
+
+struct LegacyTabView: View {
+  @ObservedObject var props: TabViewProps
+
+#if os(macOS)
+  var tabBar: NSTabView?
+#else
+  var tabBar: UITabBar?
+#endif
+  
+  var onLayout: (_ size: CGSize) -> Void
+  var onSelect: (_ key: String) -> Void
+  var updateTabBarAppearance: (_ props: TabViewProps, _ tabBar: UITabBar?) -> Void
+  
+  @ViewBuilder
+  var body: some View {
+    TabView(selection: $props.selectedPage) {
+      ForEach(props.children.indices, id: \.self) { index in
+        renderTabItem(at: index)
+      }
+      .measureView { size in
+        onLayout(size)
+      }
+    }
+    .hideTabBar(props.tabBarHidden)
+  }
+  
+  @ViewBuilder
+  private func renderTabItem(at index: Int) -> some View {
+    if let tabData = props.items[safe: index] {
+      let isFocused = props.selectedPage == tabData.key
+      
+      if !tabData.hidden || isFocused {
+        let icon = props.icons[index]
+        let child = props.children[safe: index] ?? PlatformView()
+        
+        RepresentableView(view: child)
+          .ignoresSafeArea(.container, edges: .all)
+          .tabItem {
+            TabItem(
+              title: tabData.title,
+              icon: icon,
+              sfSymbol: tabData.sfSymbol,
+              labeled: props.labeled
+            )
+            .accessibilityIdentifier(tabData.testID ?? "")
+            .tag(tabData.key)
+            .tabBadge(tabData.badge)
+            .onAppear {
+#if !os(macOS)
+              updateTabBarAppearance(props, tabBar)
+#endif
+#if os(iOS)
+              if index >= 4, !isFocused {
+                onSelect(tabData.key)
+              }
+#endif
+            }
+          }
+      }
+    }
+  }
+}