Add monitoring capability to empty directory

### Please agree to the following

- [x] I have searched [existing issues](https://github.com/cryptomator/cli/issues?q=) for duplicates
- [x] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/cli/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

Add mounting capability to empty directory

### Motivation

Windows 11
Cryptomator-cli 0.6.1

Hello!

Please add the ability to view the vault in an empty directory.

Currently this causes an error:


In fact, I don't see a problem specifically in this behavior.
The problem is that Cryptomator GUI, on the contrary, REQUIRES that the empty directory where the mounting will be performed exists.


That is, the CLI and GUI have different behavior that conflicts with each other.

### Considered Alternatives

_No response_

### Anything else?

_No response_