Import attachments

Proposed solution
On the attachments area there is an action button to import all attachments as documents. On each attachments there is also the same action.
When import is pressed (for all or just one file) the import modal dialog should appear with the correspondent items.
The following flow should be the same as if the user had drag and drop this files in web ui. The default import path should be the parent path of the Imap folder.

Acceptance criteria

Given I have read permission on an email message
When I navigate to that document (with attachments)
Then I see a import all action and a import action for each

Given I have read permission on an email message and am on that document
When I click the import all action
Then I see the import dialog with all the attachment blobs

Given I have read permission on an email message and am on that document
When I click the import action on a attachment
Then I see the import dialog with that blob