refactor: support unicode digits in mask input parser

- Added support for Unicode digits in the mask input parser.
- Updated relevant tests to cover Unicode digit scenarios.
- Parser edge cases handled for better robustness.
- Added more comprehensive test cases for various mask patterns.

Author: rkaraivanov

src/components/mask-input/mask-input-base.ts

@@ -88,7 +88,7 @@ export abstract class IgcMaskInputBaseComponent extends IgcInputBaseComponent {
         if (isComposing) return;
         return this._updateInput('', {
           start: this._parser.getPreviousNonLiteralPosition(
-            this._inputSelection.start
+            this._inputSelection.start + 1
           ),
           end,
         });