feat: lesion-tracker extension (#1420)

* chore: init lesion-tracker extension

* chore: dev build for lesion-tracker extension

* fix: a more appropriate library name

* chore: fix script naming

extensions/lesion-tracker/.webpack/webpack.dev.js

@@ -0,0 +1,8 @@
+const path = require('path');
+const webpackCommon = require('./../../../.webpack/webpack.commonjs.js');
+const SRC_DIR = path.join(__dirname, '../src');
+const DIST_DIR = path.join(__dirname, '../dist');
+
+module.exports = (env, argv) => {
+  return webpackCommon(env, argv, { SRC_DIR, DIST_DIR });
+};