Create the ability for a user to select the state code

[adrhumphreys]

We’ll be updating our state to store a state code which is where the user is making the purchase from:

• We’ll be treating this a non-mandatory field (e.g. they could be making the order outside of these states)
• Ideally this will be easy for a user to select without needing to memorise their state code

Outcome:

• Users are able to update the state to reflect the state they are purchasing their items from

[adrhumphreys]

Resolved by https://github.com/adrhumphreys/fictional-engine/pull/19