Sales order view item renderer name for block

[manuelson]

Sales order view item renderer name for block

Description

Creation of identification name for the block to render the information of the items in the order view in adminhtml. Required to create a custom extends in layouts.

Manual testing scenarios

1. Create custom module
2. Rewrite adminhtml/sales_order_view.xml layout
3. Add new custom column in the order_items
4. Unable to reference to block of the values (class="Magento\Sales\Block\Adminhtml\Order\View\Items\Renderer\DefaultRenderer")

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[orlangur]

Let's continue in #10936 to solve problem in general.