DCTL support (or equivalent custom programmable modules)

Is your feature request related to a problem? Please describe.

While DT is very powerful, it is always limited by the possibilities offered by the available modules, i.e. as far as I know it misses a way to fully code some operations.

DaVinci resolved fixed this by introducing DCTL that allow users to code (C-like language) their own custom transform, as a kind of LUT on steroid. As such, a wide list of DCTL is developped by the community, see for instance https://github.com/thatcherfreeman/utility-dctls

Edit: it may be easier to target Fuse files that seem more generic and use lua instead of a custom C-inspired language?

Describe the solution you'd like

Would it be possible to support dctl in DT, this way we can directly pick ekisting styles and apply them to our pictures? Or at least an equivalent where we can code our own transformations, in lua/C/whatever?

Alternatives

LUT, but they don't support parameters so they can't easily be configured for a given image, they also only support local change while DCTL can implement non-local changes like a blur etc…

Additional context

Start by comparing the requested DCTL support with the alternative Fuse files described in the issue, including their C-like or Lua-based approaches and parameter needs. Map those requirements onto darktable's existing module architecture; done means a reviewed design and clear scope for programmable, parameterized, non-local transformations.