Lua - new API quarto.format.format_identifier()

[cscheid]

Minimal self-test:

format-identifier.qmd

---
format: html+test
filters:
  - format-identifier.lua
---

format-identifier.lua

function Pandoc(doc)
  local identifier = quarto.format.format_identifier()
  assert(identifier["target-format"] == "html+test")
  assert(identifier["base-format"] == "html")
  assert(identifier["display-name"] == "HTML")
  return doc
end

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[cderv]

So if we expose this directly to LUA, I would vote for exposing exactly the same to engine
Which was exactly your idea in #2216

So we could do both for 1.8: Expose FormatIdentifier to engines and Lua process.