Reapply DataGenerators when container changes (#19357, #19359)
Reapply DataGenerators when container changes (#19357, #19359)

Previously on container change Grid applied only its internal
DataGenerators to the new RpcDataProviderExtension. Now it goes through
all existing Extensions and adds all DataGenerators to the data
provider.

Change-Id: Idbd48e5152867b1d2b7a770741e3ea08aa4299b6

jdahlstrom/vaadin.react,Legioth/vaadin,Darsstar/framework,Darsstar/framework,Legioth/vaadin,kironapublic/vaadin,asashour/framework,kironapublic/vaadin,Darsstar/framework,jdahlstrom/vaadin.react,kironapublic/vaadin,peterl1084/framework,mstahv/framework,mstahv/framework,Legioth/vaadin,Legioth/vaadin,mstahv/framework,mstahv/framework,jdahlstrom/vaadin.react,asashour/framework,kironapublic/vaadin,jdahlstrom/vaadin.react,peterl1084/framework,asashour/framework,Darsstar/framework,kironapublic/vaadin,Darsstar/framework,jdahlstrom/vaadin.react,Legioth/vaadin,peterl1084/framework,peterl1084/framework,peterl1084/framework,asashour/framework,asashour/framework,mstahv/framework