plugins don't have access to cliArgs in updateServer

Plugins should reasonably have access to cli args passed in via the plugin cli arg interface.

Currently they have access via the this.cliArgs property on a plugin instance.

But plugins can also implement static async updateServer, a method which should also reasonably have access to the plugin’s CLI args. Obviously, this.cliArgs is not a thing here.

Options:

1. make updateServer an instance method
2. figure out how to pass the cli args into updateServer so they’re accessible

[jlipps]

We might also consider whether there’s a way to make cliArgs available in the plugin constructor, since that is also a place where we might reasonably expect to do things with them.

[boneskull]

From Slack, I wrote:

so the updateServer thing for Plugins. currently it appears Plugins are instantiated lazily–not until they are needed to handle a command. I don’t think this can be the case any longer. does that sound right?

this seems like kind of a not-necessarily-wanted consequence of moving updateServer to an instance method. so maybe that’s not what we want to do. maybe we just want to supply cliArgs to static updateServer

the updateServer static method would then have a signature like type UpdateServerCallback = (expressApp: Express, httpServer: AppiumServer, cliArgs: object) => Promise<void>;

where object is something like Args