Added password driver for Mail-in-a-Box

[ashtokalo]

The driver allows to change password for email through API of Mail-in-a-Box service (https://mailinabox.email)

[alecpl]

1. All new code should use Guzzle HTTP Client instead of curl.
2. Is there no way to change password using the current user credentials instead of the admin credentials?
3. For drivers like this maybe a better option would be to use the universal driver as proposed in Add httpapi password change driver to connect to generic HTTP/HTTPS APIs #7439.

[ashtokalo]

1. All new code should use Guzzle HTTP Client instead of curl.

Done

2. Is there no way to change password using the current user credentials instead of the admin credentials?

Unfortunately, no :(

3. For drivers like this maybe a better option would be to use the universal driver as proposed in #7439.

It's up to you. But I don't believe to universal solutions. Finally they become too complex and too buggy.