Firebase 트래킹 추가

- 회원가입, 로그인

SodaLive/Sources/User/SignUp/SignUpViewModel.swift

@@ -99,6 +99,7 @@ final class SignUpViewModel: ObservableObject {
                             let decoded = try jsonDecoder.decode(ApiResponse<LoginResponse>.self, from: responseData)
                             
                             if let data = decoded.data, decoded.success {
+                                FirebaseTracking.shared.signUp(method: "email")
                                 UserDefaults.set(data.profileImage, forKey: .profileImage)
                                 UserDefaults.set(data.nickname, forKey: .nickname)
                                 UserDefaults.set(data.userId, forKey: .userId)