feat: introduce wal benchmarker (#3446)

* feat: introduce wal benchmarker

* chore: add log store metrics

* chore: add some comments to wal benchmarker

* fix: ci

* chore: add more metrics for kafka logstore

* chore: add more timers for kafka logstore

* chore: add more configs

* chore: move humantime to common dependencies

* refactor: refactor wal benchmarker

* fix: apply suggestions from code review

* doc: add a simple README for wal benchmarker

* fix: Cargo.toml

* fix: clippy

* chore: rename wal.rs to wal_bench.rs

* fix: compile

benchmarks/src/lib.rs

@@ -0,0 +1,16 @@
+// Copyright 2023 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.
+
+pub mod metrics;
+pub mod wal_bench;