feat(authentication): Add setup method for auth strategies

[vonagam]

Add setup method to AuthenticationStrategy by analogy with service setup. More convenient alternative to setAuthentication/setApplication/setName and removes the need for getters, since it ensures that all services are already registered by the time of a call.

For example, right now every time you get entityService in a strategy you call:

1. AuthenticationBaseStrategy.configuration
2. AuthenticationBase.configuration
3. Object.assign and app.get
4. app.service

All of those calls can be done once in setup method instead doing them every time.

Also fixed small inconsistencies in app.setup:

1. Moved this line up since otherwise a service registered in other service setup call will not get setup call.

2. Moved those lines down so that setup call for a dynamically registered service happens after the service is registered just like for a usual service.

[jnardone]

couldn't you do all of this in setApplication?

[vonagam]

it ensures that all services are already registered by the time of a call

setApplication (with setName, setAuthentication and verifyConfiguration) is called in register method, before setup, and not everything is set up at that point (not all services registered).

Why have those separate methods when one will do? In Service you do not have setApplication, setName or verifyConfiguration, only setup.

[jnardone]

Good points. This would be very useful for a project I'm currently working on.

[daffl]

Hm, sorry I'm not sure why this got closed. Going to reopen but will review again to add in v5 (which will also have asynchronous application setup).

[vonagam]

Rebased.

[daffl]

Will go out in the next prerelease. Better late than never I guess, sorry about that 😄