MappingsToCSharpCode should use RegexMatcher when specified

[carlin-q-scott]

Is your feature request related to a problem? Please describe.
I used the MappingsToCSharpCode on the WiremockServer class to get C# mappings for my json mocks and it did not respect the matchers. It assumed everything was an exact match.

My json defined mock:

{
  "Request": {
    "Methods": [
      "POST"
    ],
    "Path": "/auth",
    "Params": [
      {
        "Name": "clientId",
        "Matchers": [
          {
            "Name": "RegexMatcher",
            "Pattern": "^scenario_(.+)$"
          }
        ]
      }
    ]
  }
}

The resulting CSharpCode:

builder
    .Given(Request.Create()
        .UsingMethod("POST")
        .WithPath("/auth")
        .WithParam("clientId", $"^scenario_(.+)$")
    )

Describe the solution you'd like
If the Matcher.Name is RegexMatcher, then create a RegexMatcher instead of directly passing the pattern to the RequestBuilder method.

builder
    .Given(Request.Create()
        .UsingMethod("POST")
        .WithPath("/auth")
        .WithParam("clientId", new RegexMatcher($"^scenario_(.+)$"))
    )

Describe alternatives you've considered
Manually fixing the generated code.

Is your feature request supported by WireMock (java version)? Please provide details.
I don't think this relevant.

Additional context
Add any other context or screenshots about the feature request here.

[StefH]

@carlin-q-scott
This is indeed invalid.
(ExactMatcher and LinqMatcher are also not correctly transformed)

However fixing this needs a complete rewrite from the generating logic...
(Currently the logic is defined in 1 class, but the knowledge about the parameters should be moved to the matcher itself...)

[StefH]

#1152

[StefH]

@carlin-q-scott
If you want, you can use preview 1.5.62-ci-19075 to test.