New unicode-graphemes addon.

Handle grapheme cluster lookup as well as wcwidth.
This is based on Unicode 15, and could replace the unicode11 addon.

addons/xterm-addon-unicode-graphemes/src/UnicodeGraphemesAddon.ts

@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2023 The xterm.js authors. All rights reserved.
+ * @license MIT
+ *
+ * UnicodeVersionProvider for V15 with grapeme cluster handleing.
+ */
+
+import { Terminal, ITerminalAddon } from 'xterm';
+import { UnicodeGraphemeProvider } from './UnicodeGraphemeProvider';
+
+
+export class UnicodeGraphemesAddon implements ITerminalAddon {
+  public activate(terminal: Terminal): void {
+    terminal.unicode.register(new UnicodeGraphemeProvider());
+  }
+  public dispose(): void { }
+}