Add Malta country rules

[GeorgeLimaDev]

What is the purpose of this pull request?

It relates to the task LOC-14346. Adds country rules for the country of Malta (MLT).

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.

[vtex-io-ci-cd]

Hi! I'm VTEX IO CI/CD Bot and I'll be helping you to publish your app! 🤖

Please select which version do you want to release:

• Patch (backwards-compatible bug fixes)

• Minor (backwards-compatible functionality)

• Major (incompatible API changes)

And then you just need to merge your PR when you are ready! There is no need to create a release commit/tag.

• No thanks, I would rather do it manually 😞

[sheilagomes]

LGTM

[jeffersontuc]

Hi, @GeorgeLimaDev
This address-form version is not used on the Checkout, so I'm afraid the test plan for #559 doesn't fit for this PR. I would suggest to test theses changes on MyAccount's side, since I suppose is the place where this 4.x major is mainly used.

You can ask for help from the OrderManagement team, in case you need it.