Ability to choose name when creating / importing an account in kmd with goal

**Is your feature request related to a problem? Please describe.**

Currently, when creating a new account or importing an account, with `goal account new` or `goal account import`, the account is called `Unnamed-{i}`, where `{i}` cannot be easily predicted (if the wallet was not empty).

Having a friendly name is often convenient.

The current way to do it is to find the exact account name using `goal account list` from the address displayed by `goal account import` / `goal account new`, and then call `goal account rename` with the old name and the new name.

**Describe the solution you'd like**

It would be great to have an option `--name` to `goal account import` and `goal account new` to offer directly the option to choose the name.