feat: add features to conformance and do some refactors (#532)

Signed-off-by: bitliu <bitliu@tencent.com>

test/e2e/conformance/utils/suite/features.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package suite
+
+import "istio.io/istio/pilot/pkg/util/sets"
+
+type SupportedFeature string
+
+const (
+	// core: http
+	HTTPConformanceFeature SupportedFeature = "http"
+
+	// extended: extensibility
+	WASMGoConformanceFeature  SupportedFeature = "wasm-go"
+	WASMCPPConformanceFeature SupportedFeature = "wasm-cpp"
+
+	// extended: service discovery
+	DubboConformanceFeature  SupportedFeature = "dubbo"
+	EurekaConformanceFeature SupportedFeature = "eureka"
+	ConsulConformanceFeature SupportedFeature = "consul"
+	NacosConformanceFeature  SupportedFeature = "nacos"
+)
+
+var AllFeatures = sets.Set{}.
+	Insert(string(HTTPConformanceFeature)).
+	Insert(string(DubboConformanceFeature)).
+	Insert(string(EurekaConformanceFeature)).
+	Insert(string(ConsulConformanceFeature)).
+	Insert(string(NacosConformanceFeature))
+
+var ExperimentFeatures = sets.Set{}.
+	Insert(string(WASMGoConformanceFeature)).
+	Insert(string(WASMCPPConformanceFeature))