handlebars: added partials/decorators fields and registerDecorator/unregisterDecorator methods (#14895)
handlebars: added partials/decorators fields and registerDecorator/unregisterDecorator methods (#14895)


alexdresko/DefinitelyTyped,QuatroCode/DefinitelyTyped,chrootsu/DefinitelyTyped,minodisk/DefinitelyTyped,benishouga/DefinitelyTyped,aciccarello/DefinitelyTyped,benishouga/DefinitelyTyped,borisyankov/DefinitelyTyped,AgentME/DefinitelyTyped,dsebastien/DefinitelyTyped,dsebastien/DefinitelyTyped,YousefED/DefinitelyTyped,mcrawshaw/DefinitelyTyped,rolandzwaga/DefinitelyTyped,zuzusik/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,jimthedev/DefinitelyTyped,alexdresko/DefinitelyTyped,abbasmhd/DefinitelyTyped,smrq/DefinitelyTyped,arusakov/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,rolandzwaga/DefinitelyTyped,QuatroCode/DefinitelyTyped,magny/DefinitelyTyped,zuzusik/DefinitelyTyped,one-pieces/DefinitelyTyped,amir-arad/DefinitelyTyped,arusakov/DefinitelyTyped,smrq/DefinitelyTyped,abbasmhd/DefinitelyTyped,benishouga/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,benliddicott/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,YousefED/DefinitelyTyped,georgemarshall/DefinitelyTyped,chrootsu/DefinitelyTyped,mcliment/DefinitelyTyped,AgentME/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,nycdotnet/DefinitelyTyped,GiedriusGrabauskas/DefinitelyTyped,AgentME/DefinitelyTyped,nycdotnet/DefinitelyTyped,isman-usoh/DefinitelyTyped,AgentME/DefinitelyTyped,ashwinr/DefinitelyTyped,georgemarshall/DefinitelyTyped,ashwinr/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped,borisyankov/DefinitelyTyped,jimthedev/DefinitelyTyped,georgemarshall/DefinitelyTyped,jimthedev/DefinitelyTyped,magny/DefinitelyTyped,zuzusik/DefinitelyTyped,minodisk/DefinitelyTyped,aciccarello/DefinitelyTyped,mcrawshaw/DefinitelyTyped,isman-usoh/DefinitelyTyped,johan-gorter/DefinitelyTyped,johan-gorter/DefinitelyTyped,arusakov/DefinitelyTyped,aciccarello/DefinitelyTyped