✨ [Feat] LoadingView 컴포넌트 구현

AppProduct/AppProduct/Core/Common/UIComponents/LoadingView/LoadingViewModifier.swift

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+//
+//  LoadingViewModifier.swift
+//  AppProduct
+//
+//  Created by 이예지 on 1/4/26.
+//
+
+import SwiftUI
+
+// MARK: - LoadingViewModifier
+
+struct LoadingViewModifier: ViewModifier {
+
+    /// LoadingMessage
+    enum LoadingMessage: String {
+        case basicLoading = "이동중이에요!"
+        case loginLoading = "로그인 중이에요!"
+        case assignmentLoading = "과제를 제출하고 있어요!"
+        case noticeLoading = "공지를 보내는 중이에요!"
+    }
+
+    let loadingMessage: LoadingMessage
+    let controlSize: ControlSize
+
+    func body(content: Content) -> some View {
+        content
+            .overlay(content: {
+                ZStack {
+                    Color.black.opacity(0.5)
+
+                    ProgressView(label: {
+                        Text(loadingMessage.rawValue)
+                    })
+                    .controlSize(controlSize)
+                }
+            })
+    }
+}
+
+// MARK: - LoadingView Extension
+
+extension View {
+    func loadingModifier(loadingMessage: LoadingViewModifier.LoadingMessage, controlSize: ControlSize) -> some View {
+        self.modifier(LoadingViewModifier(loadingMessage: loadingMessage, controlSize: controlSize))
+    }
+}