fix: extend wellknown return values (#704) (#706)

* response_types_supported
* response_modes_supported

Author: pniederlag

src/main/kotlin/no/nav/security/mock/oauth2/http/OAuth2HttpResponse.kt

@@ -67,7 +67,9 @@ data class WellKnown(
     @JsonProperty("introspection_endpoint")
     val introspectionEndpoint: String,
     @JsonProperty("response_types_supported")
-    val responseTypesSupported: List<String> = listOf("query", "fragment", "form_post"),
+    val responseTypesSupported: List<String> = listOf("code", "none", "id_token", "token"),
+    @JsonProperty("response_modes_supported")
+    val responseModesSupported: List<String> = listOf("query", "fragment", "form_post"),
     @JsonProperty("subject_types_supported")
     val subjectTypesSupported: List<String> = listOf("public"),
     @JsonProperty("id_token_signing_alg_values_supported")

src/test/kotlin/no/nav/security/mock/oauth2/e2e/WellKnownIntegrationTest.kt

@@ -32,6 +32,7 @@ class WellKnownIntegrationTest {
                         "userinfo_endpoint",
                         "jwks_uri",
                         "introspection_endpoint",
+                        "response_modes_supported",
                         "response_types_supported",
                         "subject_types_supported",
                         "id_token_signing_alg_values_supported",