Added the Batch Processing Assistant (#901)

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

app/MindWork AI Studio/Assistants/BatchProcessing/BatchProcessingCsvSeparatorExtensions.cs

@@ -0,0 +1,41 @@
+namespace AIStudio.Assistants.BatchProcessing;
+
+public static class BatchProcessingCsvSeparatorExtensions
+{
+    private const char DEFAULT_SEPARATOR = ';';
+
+    private static string TB(string fallbackEN) => Tools.PluginSystem.I18N.I.T(fallbackEN, typeof(BatchProcessingCsvSeparatorExtensions).Namespace, nameof(BatchProcessingCsvSeparatorExtensions));
+
+    public static string Name(this BatchProcessingCsvSeparator separator) => separator switch
+    {
+        BatchProcessingCsvSeparator.COMMA => TB("Comma (,)"),
+        BatchProcessingCsvSeparator.SEMICOLON => TB("Semicolon (;)"),
+        BatchProcessingCsvSeparator.PIPE => TB("Vertical bar (|)"),
+        BatchProcessingCsvSeparator.TAB => TB("Tab"),
+        BatchProcessingCsvSeparator.CUSTOM => TB("Custom character"),
+
+        _ => TB("Unknown"),
+    };
+
+    public static char Character(this BatchProcessingCsvSeparator separator, string customSeparator) => separator switch
+    {
+        BatchProcessingCsvSeparator.COMMA => ',',
+        BatchProcessingCsvSeparator.SEMICOLON => ';',
+        BatchProcessingCsvSeparator.PIPE => '|',
+        BatchProcessingCsvSeparator.TAB => '\t',
+        BatchProcessingCsvSeparator.CUSTOM when IsValidCustomSeparator(customSeparator) => customSeparator[0],
+
+        _ => DEFAULT_SEPARATOR,
+    };
+
+    internal static bool IsValidCustomSeparator(string separator)
+    {
+        if (string.IsNullOrEmpty(separator) || separator.Length is not 1)
+            return false;
+
+        var character = separator[0];
+        return !char.IsLetterOrDigit(character)
+               && !char.IsWhiteSpace(character)
+               && character is not '"' and not '\r' and not '\n';
+    }
+}