This MR adds a simple file store to the plugin registry.
Description
The file store allows a very basic and simple persistence of plugins.
The aim is to provide a simple implementation that allows plugin information to be available even after a restart of the registry.
Related Issue
Motivation and Context
Currently UUIDs for plugins within the registry have been hard-coded.
How Has This Been Tested?
Screenshots (if appropriate):
Types of changes
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)
