FEATURE: [UI] Adding metadata at upload

[zzzepezzz]

Is your feature request related to a problem? Please describe.
When uploading a file, it is not possible to directly add metadata. For our instance, we build a new front to Aleph that can request the API to ingest document with given metadata.

Describe the solution you'd like
It would be nice if it was possible natively in the Aleph UI. Open a window at upload that allow analysts to add all the metadata they want.

[zzzepezzz]

In the same way, modifying metadatas should be possible throught the UI