expose applyOptimisticUpdate on RelayModern
expose applyOptimisticUpdate on RelayModern

Summary: We already expose this on RelayCompat, we should do the same in RelayModern.

Reviewed By: jstejada

Differential Revision: D8334279

fbshipit-source-id: a77ffb3ca7b9bd28df2e8e414d95b965860881c0

wincent/relay,voideanvalue/relay,wincent/relay,facebook/relay,josephsavona/relay,freiksenet/relay,atxwebs/relay,atxwebs/relay,freiksenet/relay,wincent/relay,atxwebs/relay,cpojer/relay,zpao/relay,cpojer/relay,josephsavona/relay,kassens/relay,iamchenxin/relay,kassens/relay,dbslone/relay,facebook/relay,xuorig/relay,voideanvalue/relay,xuorig/relay,facebook/relay,xuorig/relay,xuorig/relay,voideanvalue/relay,iamchenxin/relay,wincent/relay,yungsters/relay,dbslone/relay,iamchenxin/relay,facebook/relay,xuorig/relay,yungsters/relay,josephsavona/relay,kassens/relay,kassens/relay,zpao/relay,wincent/relay,freiksenet/relay,xuorig/relay,voideanvalue/relay,atxwebs/relay,iamchenxin/relay,facebook/relay,yungsters/relay,cpojer/relay,voideanvalue/relay,facebook/relay,wincent/relay,kassens/relay,voideanvalue/relay,kassens/relay,cpojer/relay,zpao/relay