Added file patterns and exclusions to folder data sources (#1057)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Services/DataSourceEmbeddingIgnoreReason.cs

@@ -0,0 +1,10 @@
+namespace AIStudio.Tools.Services;
+
+/// <summary>
+/// Why a file found while enumerating a local data source was deliberately left out of its index.
+/// </summary>
+public enum DataSourceEmbeddingIgnoreReason
+{
+    MEDIA_NOT_SUPPORTED,
+    TOO_LARGE,
+}