Multi-layers support for PDF files

User story

As a user, I want to select/unselect the layer(s) available on the PDF file I'm viewing, so that I can decide which one(s) are displayed/hidden in the rendering.

Description

The goal is to add a section on the Arender view which contain:

• the list of all the layers available on the PDF file,
• a checkbox to check/uncheck all layers (meaning display or hide all layers)
• a checkbox per layer to display/hide each of them

Acceptance criteria

• Given I'm a user with read permissions, And I have opened a PDF with layers, When I go to the Arender view (Annotations tab), Then I can see a layer section.**
• Given I'm a user with read permissions, And I have opened a PDF without layers, When I go to the Arender view (Annotations tab), Then there is no layer section.
• Given I'm a user with read permissions, And I have opened a PDF with layers, When I go to the Arender view (Annotations tab), And I click on uncheck all layers, Then the PDF is displayed without any layer.
• Given I'm a user with read permissions, And I have opened a PDF with layers, When I go to the Arender view (Annotations tab), And I click on check all layers, Then the PDF is displayed with all the layers.
• Given I'm a user with read permissions, And I have opened a PDF with layers, When I go to the Arender view (Annotations tab), And I click on uncheck a given layer, Then the PDF is displayed without the unchecked layer.
• Given I'm a user with read permissions, And I have opened a PDF with a layer defined as displayed by default, When I go to the Arender view (Annotations tab), Then the layer is checked by default and the PDF is displayed with the layer.
• Given I'm a user with read permissions, And I have opened a PDF with a layer defined as NOT displayed by default, When I go to the Arender view (Annotations tab), Then the layer is unchecked by default and the PDF is displayed without the layer.