[Stretch] Investigate if we can use config instead of defaults in createAll to get the configuration type

[romaricpascal]

What

Investigate if createAll could keep checking the type of the config it receives based on the Component it's initialising through another way than using the type of its defaults property.

Why

At the moment createAll's types use the defaults field of the component it receives as first argument to check the type of the configuration it receives as second argument. This implies:

1. That components needing a configuration need to expose these defaults as public
2. A constraint for components needing configuration to have defaults in the first place (even if empty/falsy), meaning extra code sent to the client

It'd be great if we could reduce these requirements

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• We've investigated, assessed the impacts of a potential solution, and decided on whether to update our implementation or keep it as is.