Add connectedTo for inline repeater and documentation about connectedTo

[Tofandel]

Add the connectedTo method to InlineRepeater because it was missing and document the connectedTo method for the FormBuilder

I'm still thinking connected fields would be better as another Form component because this is the only one not respecting the convention (all other components have their own class) and it creates disparity in the form builder, it also doesn't allow to encapsulate multiple fields at once or views because of this

I might PR the addition of the service with deprecation of the connectedTo later on