Add autofill tokens to the checkout address and contact fields

[boo-code]

Questions	Answers
Description?	The one-page checkout renders the delivery address, the invoice address and the guest contact e-mail without any autocomplete attribute, so browser autofill cannot reliably fill the checkout (measured on a default 9.2 + hummingbird install: 0 of the checkout fields carried an autofill token). This populates the standard WHATWG autofill tokens server-side in AddressFieldsFormatTrait (given-name, family-name, organization, address-line1, address-line2, address-level2, address-level1, postal-code, tel, country), scoped with the shipping / billing section keyword — the two address forms live on the same page, so the section keyword is what lets the browser fill the right form. The guest e-mail input gets autocomplete="email", and the module-owned country/state selects render the attribute from the field definition. Reducing checkout typing effort is a standard checkout-UX recommendation (Baymard Institute) and the tokens also satisfy WCAG 2.1 SC 1.3.5 (Identify Input Purpose, level AA). Notes: alias, vat_number and dni have no standard autofill token and stay untouched; the inline state select is rendered by the theme's form-fields.tpl select branch, which does not output autocomplete yet, so only the modal state select renders it for now (candidate follow-up in the theme).
Type?	improvement
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?	vendor/bin/phpunit -c tests/php/phpunit.xml --filter AddressFieldsFormatTraitTest (19 tests green; full unit suite 212 tests green). On a 9.2 shop with the module enabled, open the one-page checkout and inspect the form: the delivery fields carry autocomplete="shipping ..." tokens, the invoice fields autocomplete="billing ...", the guest e-mail autocomplete="email". Browser autofill now offers to fill the address forms.

[ps-jarvis]

Hello @boo-code!

This is your first pull request on ps_onepagecheckout repository of the PrestaShop project.

Thank you, and welcome to this Open Source community!