[RTM] Config providers

[qzminski]

• [x] Disable the database config provider if backend_management is set to false?
• [x] Add the priority tag for config provider services
• [x] Add the missing unit tests
• [x] Add the docs

[qzminski]

Hey @Toflar you can check the concept already. I will add the unit tests after your confirmation.

One thing to discuss: should we disable the database config provider if backend_management is set to false? During my tests I have temporarily disabled the backend management but still had entries in the database and they were added to the routing configuration.

[Toflar]

One thing to discuss: should we disable the database config provider if backend_management is set to false?

I think the other way around. Only add it to the chain provider if it is enabled :) You can even optimize the compiler pass in such a way that it only uses the chain provider if there are more than one providers 😎

[qzminski]

I think the other way around. Only add it to the chain provider if it is enabled :)

But technically, how to do it? Should we introduce some isActive() method for the config providers or just hardcode that requirements in the compiler pass?

[Toflar]

Hardcode, that's what compiler passes are here for. If I want to add another conditional config provider I can only tag it in my extension if my own conditions are met :)

[Toflar]

Looks good to me now, excellent! Ready for unit tests and docs 👍

[qzminski]

@Toflar all done here. Shall I merge it as 1.1?

[Toflar]

Perfect, go ahead! Excellent work 👍