Added transcription of audio and video files to local data sources (#1081)

Co-authored-by: Paul Koudelka <106623909+PaulKoudelka@users.noreply.github.com>

app/MindWork AI Studio/Tools/Media/IMediaTranscriptLocation.cs

@@ -0,0 +1,19 @@
+namespace AIStudio.Tools.Media;
+
+/// <summary>
+/// Where the persistent transcript of an audio or video file lives, cf. PersistentMediaTranscript.
+/// </summary>
+/// <remarks>
+/// A location only names the place. Reading and writing the transcript is left to
+/// PersistentMediaTranscript, so every location keeps the same rules against paying twice.
+/// </remarks>
+internal interface IMediaTranscriptLocation
+{
+    /// <summary>
+    /// Finds the place of the transcript of a media file.
+    /// </summary>
+    /// <param name="mediaPath">The audio or video file.</param>
+    /// <param name="token">The cancellation token.</param>
+    /// <returns>The place of the transcript, whether or not a transcript is there yet.</returns>
+    Task<MediaTranscriptSlot> ResolveAsync(string mediaPath, CancellationToken token);
+}