Make text watcher in mention plugin recognize more complex patterns

[Dumluregn]

📝 Provide detailed reproduction steps (if any)

1. Disable the marker validation (https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-mention/src/mentionui.ts#L171-L185).
2. Set the feed with one of the patterns: AAA, ABA, ABAC (e.g. {{{ ).
3. Try inserting the mention with the configured pattern.

✔️ Expected result

Mentions dropdown is visible.

❌ Actual result

Text watcher created in the mentions plugin doesn't recognize the pattern.

❓ Possible solution

I'm reporting it as a feature request because I don't know if that's a problem in the text watcher itself or it's because the mention feature accepts only a single-character markers by design.

📃 Other details

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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