Expose axios instance for use in server middleware

[rchl]

I'd like to use axios instance created by this module in server middleware.

It's currently only available in webpack context and for server middleware I need to create my own which means I have to duplicate configuration and also I don't have helper methods available like $get.

The instance could be created directly from the module (not from the plugin as that runs later than server middlewares are parsed) and assigned to process.axios for example.