Feature Request: API for Custom Animations

[Jipok]

Current picom animations are great, but they're limited by DSL capabilities. Would it be possible to add API/IPC support or scripting (e.g., Lua) for custom animations?

Use case: I'd like to trigger animations directly from AwesomeWM config to create effects similar to niri's workspace switching (https://github.com/YaLTeR/niri?tab=readme-ov-file#video-demo). With current picom capabilities, implementing such animations seems impossible without hacky workarounds like dynamic window class changes.

I believe many users have interesting animation ideas, but the DSL limitations make them technically unfeasible, even though they shouldn't be complex to implement with proper API/scripting support.