Add DeserializeGroup function wrapper

Sources/XXClient/Functions/DeserializeGroup.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct DeserializeGroup {
+  public var run: (Data) throws -> Group
+
+  public func callAsFunction(_ serializedGroupData: Data) throws -> Group {
+    try run(serializedGroupData)
+  }
+}
+
+extension DeserializeGroup {
+  public static func live() -> DeserializeGroup {
+    DeserializeGroup { serializedGroupData in
+      var error: NSError?
+      let bindingsGroup = BindingsDeserializeGroup(serializedGroupData, &error)
+      if let error = error {
+        throw error
+      }
+      guard let bindingsGroup = bindingsGroup else {
+        fatalError("BindingsDeserializeGroup returned `nil` without providing error")
+      }
+      return .live(bindingsGroup)
+    }
+  }
+}
+
+extension DeserializeGroup {
+  public static let unimplemented = DeserializeGroup(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}