Muhammad Askri

Adding CEL Regex Extensions

5

## Commit Messages ``` Adding Regex Extensions to cel-go Adding regex functions such as replace, capture, catureAll, and captureAllNamed in accordance with [Regex Design Doc](https://docs.google.com/document/d/1j5VYoAPsKSXcC8xtP-haskOcPFiUT9MwhD-dyUTFs2Y/edit?tab=t.0). ```