Create a standard for versioning "non-builtin" plugins

[brent-hoover]

I would like to propose a change for all non-built-in plugins that they provide an additional field called version in register.js that would get written to the db with other “package” info. These would be semantic version numbers maintained by the plugin owner. It would be visible from the dashboard in the “basic” config section.

This would provide us a quick and easy way to know what version of all the plugins we have running in an environment where we don’t have quick and easy access to the code. I am proposing register.js rather than package.json because it makes it easy to parse that data and add it into the Packages collection at startup

There was also a suggestion that this info be included in a health check plugin. It should probably be available to anything that queries for package info

[brent-hoover]

Closed via #4895