check: implement `check.URL`

[GregoryAlbouy]

Todo

• Generate interface check.URLChecker
• Implement check.URLCheckerProvider with the following methods (WIP suggestions):

  type  URLCheckerProvider interface {
      AsString(c StringChecker) URLCheckerProvider
      IsHTTPS() URLCheckerProvider
      Path(c StringChecker) URLCheckerProvider
      RawPath(c StringChecker) URLCheckerProvider
      RawQuery(c StringChecker) URLCheckerProvider
      HasQueryParam(key, value string) URLCheckerProvider
  }

• Write unit tests for check.URLCheckerProvider
• Implement new method to check.HTTPRequestCheckerProvider: URL(c check.URLChecker)
• Write unit tests for check.HTTPRequestCheckerProvider.URL