Missing typhints for nearly everything

[pscheit]

Hey,

thanks for porting this: Its really helpful having this, when using wiremock. I noticed that a lot classes (e.g. WireMock::create()) are missing docblocks/typehints.

Would you be willing to type everything correctly? Maybe even bump the PHP Version to 8.x?

I am happy to provide a pull request.

Best regards Philipp