added accordions for flow matching

...s/Testgenerator/rest/service/change/ChangeController.java

testgenerator-web/testgenerator-web/angular.json

testgenerator-web/testgenerator-web/package-lock.json

testgenerator-web/testgenerator-web/package.json

testgenerator-web/testgenerator-web/src/app/app.module.ts

...pp/components/matching-flows/matching-flows.component.css

...p/components/matching-flows/matching-flows.component.html

...app/components/matching-flows/matching-flows.component.ts

testgenerator-web/testgenerator-web/src/index.html

testgenerator-web/testgenerator-web/src/styles.css