Adds a panel to show CiTO annotations of citations to this retracted article

[egonw]

…if and only if there is such annotation, otherwise no panel is shown

IMPORTANT: depends on #2712 to be applied first.

Description

This patch adds an extra panel to the /retraction/Q... aspect for retracted articles which have citations to them with CiTO annotation (via an ask first, such as original implemented by Carlin for /work/). For some articles this information is very rich, as for the Wakefield article (Q28264479).

Screenshot of the proposed extra panel (along with the existing citations by year above the new panel):

Caveats

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

Testing

Test this PR on two articles, one with CiTO annotation and one without. The first should show a screenshot like above, and the second to confirm no panel shows up when no CiTO annotation is available.

• With CiTO: http://127.0.0.1:8100/retraction/Q28264479
• No CiTO, no panel: http://127.0.0.1:8100/retraction/Q29030043

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)