Add side-bar box for record uploaders

Closes #42 (closed)

This MR adds a box on the right side below the "export" box, which lists the uploaders:

Note that the current implementation only displays the box if the record exposes the record.parent.access field, which is only dumped if the active user has "manage" permissions on the record: https://github.com/inveniosoftware/invenio-rdm-records/blob/master/invenio_rdm_records/services/schemas/parent/__init__.py#L26
Effectively this means that the user has to be logged in and either be an admin, or one of the record owners.

invenio_theme_tuw/theme/templates/semantic-ui/invenio_theme_tuw/details/uploaders.html

+{#
+  Copyright (C) 2023 TU Wien.
+
+  Invenio Theme TUW is free software; you can redistribute it and/or modify
+  it under the terms of the MIT License; see LICENSE file for more details.
+#}
+
+{%- set rec = record.id|resolve_record -%}
+{%- set uploader = rec|resolve_first_user_owner -%}
+<section id="record-owners" aria-label="{{ _('Export') }}" class="ui segment rdm-sidebar owners">
+  <h1 class="ui small header">{{ _('Uploader')}}</h1>
+
+  <section>
+    {%- if uploader.user_profile and uploader.user_profile.full_name -%}
+      {{ uploader.user_profile.full_name }}
+      {%- if uploader.preferences.get("email_visibility", "restricted") == "public" -%}
+        &nbsp;&ndash; <a href="mailto:{{ uploader.email }}">Contact <i class="mail icon"></i></a>
+      {%- endif -%}
+    {%- else -%}
+      N/A
+    {%- endif -%}
+  </section>
+</section>