Add node that plots graphs as geometry using parametric equations

I wanted to draw this illustration using graphite, but ended up using desmos and screenshotting it, because they support parametric equations. It will be nice to have such a node.

Desmos illustration

I think that in this node we should be able to specify density of the geometry (amount of points), because different equations require different density, and it can affect performance.

I think there also should be density multiplier for the export rendering (if there is such a regime). So that at the editing stage we may see segmented geometry, and for the final render it will be smooth.

Also, unsolved problem: how to make this node accept any amount of variables (so that you can tweak behavior of your equation, like `l` in my example). This is also the problem for the Math node. Without this, this node will be not as useful is it might be. (#2462, and see also #2459)

Commencez par lire les issues associées #2462 et #2459, puis examinez le nœud Math existant et la manière dont les nœuds exposent les variables. La tâche nécessiterait un nœud de géométrie pour les équations paramétriques avec une densité de points configurable, un multiplicateur de densité pour le rendu de l’exportation et une approche claire pour les équations comportant un nombre variable de variables.

Rédigé par le modèle d'indexation à partir du texte de l'issue.