Service for name formatting

[vkublytskyi]

Magento 2 now have several places where customer full name is formatted. This lead to code duplication and completes customizations that is required to apply formats specific to locales. In the scope of this issue new API service should be introduced that will return customer full name based on customer data (last name, firstname etc.)

Service should be declared as an interface and has default implementation equal to current behavior.

[HirokazuNishi]

These classes are calling and formatting customer's first name and last name.
(Just for name format)

• Magento\Backend\Model\Search\Order
• Magento\Checkout\Helper\Data
• Magento\Customer\CustomerData\Customer
• Magento\Customer\Helper\View
• Magento\Customer\Model\Address\AbstractAddress
• Magento\Customer\Model\Customer
• Magento\Customer\Model\ResourceModel\Customer\Collection
• Magento\Customer\view\frontend\templates\widget\name.phtml
• Magento\NewRelicReporting\Model\Observer\ReportCurrentUsers
• Magento\NewRelicReporting\Model\Observer\ReportCurrentUsersToNewRelic
• Magento\Newsletter\Model\Subscriber
• Magento\Review\Block\Adminhtml\Edit\Form
• Magento\Reports\Model\ResourceModel\Order\Collection
• Magento\Sales\Model\Order\Address
• Magento\Sales\Model\Order
• Magento\Shipping\Model\Shipping\Labels
• Magento\Signifyd\Model\SignifydGateway\Request\CardBuilder

[bravebright]

These are using getFirstName/getLastName and have to use name formatter.
(Added a little from Nishi's list.)

magento-backend

• Magento\Backend\Model\Search\Order

magento-checkout

• Magento\Checkout\Helper\Data

magento-customer

• Magento\Customer\CustomerData\Customer
• Magento\Customer\Helper\View
• Magento\Customer\Model\Address\AbstractAddress
• Magento\Customer\Model\Customer
• Magento\Customer\Model\ResourceModel\Customer\Collection
• Magento\Customer\view\frontend\templates\widget\name.phtml

magento-newrelicreporting

• Magento\NewRelicReporting\Model\Observer\ReportConcurrentAdmins
• Magento\NewRelicReporting\Model\Observer\ReportConcurrentAdminsToNewRelic
• Magento\NewRelicReporting\Model\Observer\ReportConcurrentUsers
• Magento\NewRelicReporting\Model\Observer\ReportConcurrentUsersToNewRelic

magento-newsletter

• Magento\Newsletter\Model\Subscriber

magento-reports

• Magento\Reports\Model\ResourceModel\Order\Collection

magento-review

• Magento\Review\Block\Adminhtml\Edit\Form

magento-sales

• Magento\Sales\Model\Order
• Magento\Sales\Model\Order\Address

magento-shipping

• Magento\Shipping\Model\Shipping\Labels

magento-signifyd

• Magento\Signifyd\Model\SignifydGateway\Request\CardBuilder

magento-user

• Magento\User\Model\User

[vkublytskyi]

Additional places:

• Magento\Directory\Model\Country
• app/code/Magento/Customer/etc/config.xml