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/PersistentMediaTranscriptStatus.cs

@@ -0,0 +1,63 @@
+namespace AIStudio.Tools.Media;
+
+/// <summary>
+/// How the request for a persistent transcript ended, cf. PersistentMediaTranscript.
+/// </summary>
+public enum PersistentMediaTranscriptStatus
+{
+    /// <summary>
+    /// The transcript is stored at its place and holds text.
+    /// </summary>
+    READY,
+
+    /// <summary>
+    /// There is no transcript yet, and the caller allows no transcription provider.
+    /// </summary>
+    NO_PROVIDER,
+
+    /// <summary>
+    /// The media file could not be read before it was transcribed.
+    /// </summary>
+    SOURCE_UNREADABLE,
+
+    /// <summary>
+    /// A transcript exists, but it could not be read.
+    /// </summary>
+    TRANSCRIPT_UNREADABLE,
+
+    /// <summary>
+    /// The transcription failed. The error code of the media pipeline tells why, when it is known.
+    /// </summary>
+    TRANSCRIPTION_FAILED,
+
+    /// <summary>
+    /// The transcription provider refused the media file itself, e.g., because it is too large
+    /// or damaged. It would refuse the unchanged file again.
+    /// </summary>
+    REJECTED,
+
+    /// <summary>
+    /// The media file holds no audible signal, so there was nothing to transcribe.
+    /// </summary>
+    NO_AUDIBLE_SIGNAL,
+
+    /// <summary>
+    /// The transcription provider returned no text. Nothing was stored.
+    /// </summary>
+    EMPTY,
+
+    /// <summary>
+    /// The media file changed while it was transcribed. Nothing was stored.
+    /// </summary>
+    SOURCE_CHANGED,
+
+    /// <summary>
+    /// The transcript could not be stored at its place.
+    /// </summary>
+    STORE_FAILED,
+
+    /// <summary>
+    /// The caller cancelled before a transcript was available.
+    /// </summary>
+    CANCELLED,
+}