Use moddleExtensions of target modeler

[rajgoel]

Currently, the sourceModeler is instantiated without moddleExtensions

bpmn-js-subprocess-importer/SubProcessImporter.js

Lines 11 to 16 in 13080b5

	constructor(popupMenu, bpmnReplace, bpmnjs) {
	popupMenu.registerProvider("bpmn-replace", this);
	this.bpmnjs = bpmnjs;
	// TODO: this should be provided as module parameter or automatically determined from bpmnjs
	this.moddleExtensions = {};
	}

bpmn-js-subprocess-importer/SubProcessImporter.js

Lines 55 to 56 in 13080b5

	// Create new modeler for import of the model
	const sourceModeler = new BpmnModeler( { moddleExtensions: this.moddleExtensions } );

The moddleExtensions for the target modeler should be provided as module parameter or automatically determined from bpmnjs.