feat(editor): inline footnote extension (#11908)

Closes: BS-3219

blocksuite/affine/inlines/footnote/src/store.ts

@@ -0,0 +1,19 @@
+import {
+  type StoreExtensionContext,
+  StoreExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+
+import {
+  footnoteReferenceDeltaToMarkdownAdapterMatcher,
+  markdownFootnoteReferenceToDeltaMatcher,
+} from './adapters';
+
+export class FootnoteStoreExtension extends StoreExtensionProvider {
+  override name = 'affine-footnote-inline';
+
+  override setup(context: StoreExtensionContext) {
+    super.setup(context);
+    context.register(markdownFootnoteReferenceToDeltaMatcher);
+    context.register(footnoteReferenceDeltaToMarkdownAdapterMatcher);
+  }
+}

blocksuite/affine/inlines/footnote/src/view.ts

@@ -0,0 +1,21 @@
+import {
+  type ViewExtensionContext,
+  ViewExtensionProvider,
+} from '@blocksuite/affine-ext-loader';
+
+import { effects } from './effects';
+import { FootNoteInlineSpecExtension } from './inline-spec';
+
+export class FootnoteViewExtension extends ViewExtensionProvider {
+  override name = 'affine-footnote-inline';
+
+  override effect(): void {
+    super.effect();
+    effects();
+  }
+
+  override setup(context: ViewExtensionContext) {
+    super.setup(context);
+    context.register(FootNoteInlineSpecExtension);
+  }
+}