chore: add husky to enforce conventional commit message linter

.gitignore

@@ -4,3 +4,4 @@
 target
 out
 *.iml
+node_modules

.husky/commit-msg

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx --no -- commitlint --edit ${1}

.husky/pre-push

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+set -eu
+
+if ! cargo +nightly fmt --all -- --check
+then
+    echo "There are some code style issues."
+    echo "Run `cargo fmt` first."
+    exit 1
+fi
+
+if ! cargo clippy --all-targets -- -D warnings
+then
+    echo "There are some clippy issues."
+    exit 1
+fi
+
+if ! cargo test
+then
+    echo "There are some test issues."
+    exit 1
+fi
+
+if ! cargo test --features thread_safe
+then
+    echo "There are some test issues (with `thread_safe` feature)."
+    exit 1
+fi
+
+exit 0