Parsoid: Throw errors for unimplemented methods
Parsoid: Throw errors for unimplemented methods

Bug: T230791

milimetric/restbase,d00rman/restbase,d00rman/restbase,wikimedia/mediawiki-services-restbase,cscott/restbase,Pchelolo/restbase,wikimedia/restbase,wikimedia/mediawiki-services-restbase,milimetric/restbase,Pchelolo/restbase,cscott/restbase,wikimedia/restbase