--implicit-dirs alternative?

**Describe the issue**

From the [docs](https://github.com/GoogleCloudPlatform/gcsfuse/blob/master/docs/semantics.md#files-and-directories):

> Alternatively, users can create a script which lists the buckets and creates the appropriate objects for the directories so that the --implicit-dirs flag is not used.

Why not just include a feature in `gcsfuse` itself to do perform this important task? ... or include a supplemental cli tool (e.g., `gcsfuse-mkdirs`)?

Adding such a feature would obviate the need for each developer to create the same script.

**To Collect more Debug logs**

N/A

**System (please complete the following information):**
- OS: Debian 11
- Platform: Cloud Engine VM