Render PlantUML markup in org-mode documents

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Problem to solve

Rendering of embedded PlantUML has been supported for various markdown formats since release 8.16. However org-mode isn't one of the supported formats (possibly because org-mode markup support was introduced later?).

Further details

Org-mode markup already supported. Typically a plantuml snippet would be embedded in an org-babel source block, e.g.:

#+BEGIN_SRC plantuml file:salutations.svg
Bob --> Alice: Wahey!
Alice --> Bob: Wahoo!
#+END_SRC

Proposal

Extend support for rendering embedded PlantUML to org-mode markup.

What does success look like, and how can we measure that?

The rendered view of an org-mode document contains a rendered plantuml diagram rather than a listing of the plantuml source.

Progress

Partial progress was made in !236244 (merged) by @skkzsh (merged in 19.1), which added syntax highlighting and Mermaid diagram rendering for org-mode #+begin_src blocks. However, PlantUML rendering in org-mode remains unimplemented and is the outstanding work for this issue.