@Extension on pathParam is added to operation

[tkalmar]

When annotating an @Param with an @Extension the extension is generated at the wrong position in the yaml and json
adding

   @GET
    @Path("pathParamExtension/{param}")
    public String getParamWithExtension(@PathParam("param") @Extension(name = "x-operation-extension-3", value = "Operation extension wrapper value (3).") String param) {
        return "Path param extension value.";
    }

to io.smallrye.openapi.tck.extra.extensions.ExtensionResource and then

     @RunAsClient
        @Test(dataProvider = "formatProvider")
        public void testPathParamExtensions(String type) {
            ValidatableResponse vr = this.callEndpoint(type);
            String operation = "paths.'/extensions/pathParamExtension/{param}'.get";
            vr.body(operation + ".x-parameter-extension", nullValue());
            vr.body(operation + ".parameters[0].x-parameter-extension", equalTo("Operation extension wrapper value (3)."));
        }

to io.smallrye.openapi.tck.extra.ExtensionsTest demonstrates the wrong behaviour.

[tkalmar]

cc @famod