Update document upload api to enhance existing document upload experience

- All the contributions (knowledge and skill) now given the name
  on creation and not on submit from server side, to drive the
  workflow using the contribution name.
- User is only allowed to see the document related to that knowledge
  contribution, rather than all the documents across all the
  contributions.
- Documents are now submitted when user submits the contribution.
- Existing documents are fetched when user edits the contribution. Both
  newly uploaded documents and the existing documents are presented to
  the user.
- If user cancel the edit or doesn't submit the contribution, documents
  are not uploaded and the previous commit sha will remain unchanged in the yaml.
- If user edits the knowledge contribution and adds/removes new/existing documents,
  all the existing and new documents will be shown to the user and
  submitted when user submit the contribution.
- User don't have to worry about the commit sha anymore. Api
  implementation takes care of collecting all the documents
  and committing them in a single commit and using the sha in yaml.
- API's also provide option to user to delete any of the existing
  uploaded document, but it's currently is not used. We need to
  design a workflow on how user can manage the contribution related documents.
- This workflow works similarly for both github and native mode.

Signed-off-by: Anil Vishnoi <[email protected]>

Author: vishnoianil

.env.native.example

@@ -1,3 +1,4 @@
+IL_UI_DEPLOYMENT=native
 IL_UI_ADMIN_USERNAME=admin
 IL_UI_ADMIN_PASSWORD=password