Made the transcribing callable and per-call for the transcribing protocol in the Recording package target.

Packages/Features/Sources/Recording/Services/DummyTranscribing.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+/// The transcribing service used for development, which simulates the transcription work.
+///
+/// The service is internal on purpose: it only backs the feature's previews and the default values of its model, and is not part of the
+/// package's public interface.
+struct DummyTranscribing: Transcribing {
+
+    // MARK: Methods
+
+    /// Simulates the transcription of the given recorded audio with a two-second delay.
+    ///
+    /// - Parameters:
+    ///   - audio: The recorded audio to transcribe.
+    ///   - locale: The locale of the spoken language to transcribe.
+    /// - Returns: A dummy transcription.
+    func callAsFunction(
+        _ audio: Data,
+        locale: Locale
+    ) async throws -> Transcription {
+        try await Task.sleep(for: Constant.Delay.transcribing)
+
+        return .init(text: Constant.Text.transcription)
+    }
+
+}
+
+// MARK: - Constants
+
+/// The constant values used across the transcribing services.
+private enum Constant {
+    /// The delay constants.
+    enum Delay {
+        /// The duration of the simulated transcription work.
+        static let transcribing: Duration = .seconds(2)
+    }
+
+    /// The text constants.
+    enum Text {
+        /// The dummy transcription of a recorded audio.
+        static let transcription = "This is a dummy transcription of the recorded audio."
+    }
+}