chore: add lerna version bump script (#2932)

* chore: add lerna version bump script

Author: AllanZhengYP

package.json

@@ -29,7 +29,8 @@
     "pretest:e2e": "yarn build:crypto-dependencies && lerna run --scope '@aws-sdk/{client-cloudformation,karma-credential-loader}' --include-dependencies build",
     "test:e2e": "node ./tests/e2e/index.js",
     "test:versions": "jest --config tests/versions/jest.config.js tests/versions/index.spec.ts",
-    "local-publish": "node ./scripts/verdaccio-publish/index.js"
+    "local-publish": "node ./scripts/verdaccio-publish/index.js",
+    "lerna:version": "lerna version --exact --conventional-commits --no-push --no-git-tag-version --no-commit-hooks --loglevel silent --no-private --yes"
   },
   "repository": {
     "type": "git",