Submission workflow: add new input field - local.note-submission or something like that

[milanmajchrak]

The User should have an option to add any note to the submission during creating. This note will be added into specific metadata (check v5).

• This metadata can see only admin
• This note should be specially showed for the admin in the workflow tasks.

[milanmajchrak]

Duplicity of this: https://github.com/dataquest-dev/dspace-angular/issues/653