Add possibility to create address attribute

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

Similar to the dialog for adding a customer attribute I think it's equally useful to have the possibility to add properly address attributes to help with customizing the checkout process.

**Describe the solution you'd like** (*)

I'd like to see another item in this dialog

That allows me to add an Address Attribute easily

**Describe alternatives you've considered**

Currently we manually generate code for adding address attributes

**Additional context**

A common scenario is adding a few extra fields in the address like for accounting purposes additionally to vat id and company name required in some countries.

Start by inspecting the existing dialog for adding customer attributes, using the issue description and screenshot as the functional reference. Add a corresponding option for address attributes that supports the described checkout customization use case; done means the dialog can generate address-attribute code instead of requiring manual generation.

Written by the indexing model from the issue text.