Add new helper for request param matching on a regEx

### New Issue Checklist

- [x] I have tried with the latest version of OHHTTPStubs
- [x] I have read the [README](https://github.com/AliSoftware/OHHTTPStubs/blob/master/README.md)
- [x] I have read the [Using the right Swift Version of `OHHTTPStubs` for your project](https://github.com/AliSoftware/OHHTTPStubs#using-the-right-swift-version-of-ohhttpstubs-for-your-project) section
- [x] I have searched in the [existing issues](https://github.com/AliSoftware/OHHTTPStubs/issues?utf8=✓&q=is%3Aissue)
- [x] I have read [the OHHTTPStubs wiki](https://github.com/AliSoftware/OHHTTPStubs/wiki) to see if there wasn't a detailed page talking about my issue

### Environment

- version of OHHTTPStubs: 8.0.0
- integration method you are using:
* [x] Cocoapods
* [ ] Carthage
* [ ] submodule
* [ ] other
- version of the tool you use: [INSERT VERSION HERE]

### Issue Description

Not an issue but a proposition of a new helper. I use your library for testing my project and I thank you very much, it's very usefull.
For our project needs I've written a new helper I called 'containsQueryParamsMatching'. Whereas the existing helper 'containsQueryParams' matches on query parameter string value equality, 'containsQueryParamsMatching' matches on query parameter matching a given RegEx.
I'm ready to make a PR if you think this helper is usefull.