[BOOK-72] refactor: decouple NetworkRequestable from URLSession

- Removed direct conformance of URLSession to NetworkRequestable

Author: clxxrlove

src/Projects/BKNetwork/Sources/Adapter/URLSessionRequestor.swift

@@ -0,0 +1,19 @@
+// Copyright © 2025 Booket. All rights reserved
+
+import Combine
+import Foundation
+
+final class URLSessionRequestor: NetworkRequestable {
+    private let session: URLSession
+
+    init(session: URLSession = .shared) {
+        self.session = session
+    }
+
+    func data(for request: URLRequest) -> AnyPublisher<(Data, URLResponse), Error> {
+        session.dataTaskPublisher(for: request)
+            .map { ($0.data, $0.response) }
+            .mapError { $0 as Error }
+            .eraseToAnyPublisher()
+    }
+}

src/Projects/BKNetwork/Sources/Interface/NetworkRequestable.swift

@@ -6,12 +6,3 @@ import Foundation
 public protocol NetworkRequestable {
     func data(for request: URLRequest) -> AnyPublisher<(Data, URLResponse), Error>
 }
-
-extension URLSession: NetworkRequestable {
-    public func data(for request: URLRequest) -> AnyPublisher<(Data, URLResponse), Error> {
-        self.dataTaskPublisher(for: request)
-            .map { ($0.data, $0.response) }
-            .mapError { $0 as Error }
-            .eraseToAnyPublisher()
-    }
-}