Reference navigation. Reference: disabled plugin declaration -> plugin declaration

[VitaliyBoyko]

Preconditions (*)

• 2 modules in the system: Module_Foo and Module_Bar
• Module_Foo di.xml declares a plugin

<type name="SomeTarget">
    <plugin name="plugin_id" type="SomePlugin" />
</type>

• Module_Bar di.xml disables a plugin

<type name="SomeTarget">
    <plugin name="plugin_id" disabled="true" />
</type>

Acceptance criteria

• a reference navigation element is added to attribute name of the plugin tag with attribute disabled="true" to easily navigate form disabling declaration to original declaration, in this case, from Module_Bar/etc/di.xml to Module_Foo/ets/di.xml.
• the functionality is covered by tests

[drpayyne]

@magento I am working on this