Add export result by json format

...ce/dataset/components/dataset/dataset-form.component.html

...ance/dataset/components/dataset/dataset-form.component.ts

...umentation/components/dataset-by-family.component.spec.ts

...cumentation/components/dataset-card-doc.component.spec.ts

...instance/search/components/result/download.component.html

...tance/search/components/result/download.component.spec.ts

...tance/search/components/result/reminder.component.spec.ts

...ce/search/components/result/url-display.component.spec.ts

.../app/instance/search/components/summary.component.spec.ts

...pp/instance/store/effects/search-multiple.effects.spec.ts

client/src/app/metamodel/models/dataset.model.ts

client/src/test-data.ts

conf-dev/create-db.sh

server/src/Action/DatasetAction.php

server/src/Action/DatasetListAction.php

server/src/Action/StartTaskCreateResultAction.php

server/src/Entity/Dataset.php

server/tests/Action/DatasetActionTest.php

server/tests/Action/DatasetListActionTest.php