Add "note shared" indicator to notes in the notes list

[danilo04]

Fixes #1496.

Fix

Add the collaboration (note shared) icon to the notes list if the note has been shared by the user or to the user by another user.

Phone Light	Phone Dark

Tablet Light	Tablet Dark

Test

Note shared by the user

1. Tap on a note
2. Add an email to the tag list at bottom of the note
3. Tap on the back icon (top left corner) to go to the notes list
4. The note should have the shared icon
5. Long tap on the note to pin it
6. Now the note should have the pin and share icons
7. Tap on the note
8. Open right side menu (... dots) and tap on Collaborators
9. Remove all the collaborators
10. Go back to the note and then to the notes list
11. The share note icon should not be shown for the note edited.

Note shared by another user

You need two accounts for this test. Let's call them Account A and Account B

1. Login into account A
2. Tap on a note
3. Add the email of account B to the tag list at bottom of the note
4. Logout from account A
5. Login into account B
6. The note shared by account A should

Review

Only one developer and one designer are required to review these changes, but anyone can perform the review.

Release

[peril-automattic]

You can test the changes on this Pull Request by downloading the APK here.

[SylvesterWilmott]

Looks good! Thanks @danilo04