feat: supports s3 storage (#656)

* feat: adds s3 object storage configuration

* feat: adds s3 integration test

* chore: use map

* fix: forgot license header

* fix: checking if bucket is empty in test_on

* chore: address CR issues

* refactor: run s3 test with dotenv

* chore: randomize grpc port for test

* fix: README in tests-integration

* chore: remove redundant comments

tests-integration/tests/main.rs

@@ -0,0 +1,21 @@
+// Copyright 2022 Greptime Team
+//
+// 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.
+
+#[macro_use]
+mod grpc;
+#[macro_use]
+mod http;
+
+grpc_tests!(File, S3);
+http_tests!(File, S3);