More robust fix to https://github.com/magento-engcom/msi/issues/1524

[phoenix128]

This is a more robust fix for issue #1524 .
Also see: #1537 .

Description

Other than fixing #1524 and #1537 , this commit also provides a Magento2 support for non-FQN classes in interfaces.

Before this commit you were not able to import class names in interfaces used for web-API.

For example, the following interface was not working with the non-FQN name MyClass imported through the use alias definition.

namespace ...;

use My\Module\MyClass;

interface SomeInterface
{
...
/**
 * @param MyClass $param
 * ...
 */
 public function getMyMethod()
 ...
...
}

Fixed Issues (if relevant)

1. Provide robust fix for nested object instantiation via Web API #1537: Provide robust fix for nested object instantiation via Web API
2. POST V1/inventory/source-selection-algorithm-result throws exception #1524: POST V1/inventory/source-selection-algorithm-result throws exception

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)