Improve upload files interface

[ErykKul]

Extend the interface of the add uploaded files call in the js-dataverse library to accept more parameters, like tags, description, etc., and make it support adding multiple files at once, i.s.o. adding files one-by-one (addUploadedFilesToDataset call), see also https://guides.dataverse.org/en/latest/developers/s3-direct-upload-api.html#direct-add-to-dataset-api. When ready, the implementation of FileJSDataverseRepository.ts addUploadedFile method can be refactored to no longer mock a file, that is not needed here, but to use a proper interface with description, restricted boolean, tags, etc.

See: #431