Add required modules of a plugin to the classpath automatically when 'bundledPlugins' is used (#1883)

[chashnikov]

A content module registered as 'required' or 'embedded' in the plugin descriptor is guaranteed to be loaded if the plugin itself is loaded. Since 'depends' tag adds classloaders from all content modules as parent classloaders, references to classes from such modules will be resolved at runtime.

Related Issue

#1883

Motivation and Context

To fix #1883.

How Has This Been Tested

I tested it manually with dependency on YAML plugin in 251.20015.29-EAP-SNAPSHOT build. Not sure how to create a proper automatic test.

Types of changes

• Docs change / refactoring / dependency upgrade
• 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)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have included my change in the CHANGELOG.
• I have added tests to cover my changes.
• All new and existing tests passed.

[hsz]

Thank you!