chore: drop the support for DeltaX.fromHtml and DeltaX.fromMarkdown and will be only used internally

lib/src/models/documents/delta_x.dart

@@ -14,6 +14,12 @@ class DeltaX {
   /// This api is **experimental** and designed to be used **internally** and shouldn't
   /// used for **production applications**.
   @experimental
+  @Deprecated(
+    '''
+    The experimental support for Markdown conversion has been dropped and will be removed in future releases, 
+    consider using alternatives such as https://pub.dev/packages/markdown_quill
+    ''',
+  )
   static Delta fromMarkdown(String markdownText) {
     final mdDocument = md.Document(encodeHtml: false);
     final mdToDelta = MarkdownToDelta(markdownDocument: mdDocument);
@@ -22,6 +28,12 @@ class DeltaX {
 
   /// Convert the HTML Raw string to [Delta]
   @experimental
+  @Deprecated(
+    '''
+    The experimental support for HTML conversion has been dropped and will be removed in future releases, 
+    consider using alternatives such as https://pub.dev/packages/flutter_quill_delta_from_html
+    ''',
+  )
   static Delta fromHtml(String htmlText, {List<CustomHtmlPart>? customBlocks}) {
     final htmlToDelta = HtmlToDelta(customBlocks: customBlocks);
     return htmlToDelta.convert(htmlText);

lib/src/models/documents/document.dart

@@ -480,6 +480,12 @@ class Document {
 
   /// Convert the HTML Raw string to [Document]
   @experimental
+  @Deprecated(
+    '''
+    The experimental support for HTML conversion has been dropped and will be removed in future releases, 
+    consider using alternatives such as https://pub.dev/packages/flutter_quill_delta_from_html
+    ''',
+  )
   static Document fromHtml(String html) {
     return Document.fromDelta(DeltaX.fromHtml(html));
   }

lib/src/widgets/quill/quill_controller.dart

@@ -583,6 +583,7 @@ class QuillController extends ChangeNotifier {
     final htmlText = await getHTML();
     if (htmlText != null) {
       final htmlBody = html_parser.parse(htmlText).body?.outerHtml;
+      // ignore: deprecated_member_use_from_same_package
       final deltaFromClipboard = DeltaX.fromHtml(htmlBody ?? htmlText);
 
       _pasteUsingDelta(deltaFromClipboard);
@@ -608,6 +609,7 @@ class QuillController extends ChangeNotifier {
 
     final markdownText = await getMarkdown();
     if (markdownText != null) {
+      // ignore: deprecated_member_use_from_same_package
       final deltaFromClipboard = DeltaX.fromMarkdown(markdownText);
 
       _pasteUsingDelta(deltaFromClipboard);

test/utils/delta_x_test.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: deprecated_member_use_from_same_package
+
 import 'package:flutter_quill/quill_delta.dart';
 import 'package:flutter_quill/src/models/documents/delta_x.dart';
 import 'package:test/test.dart';