signal to end processing early e.g. via AbortController API

[RECodtSTD]

I couldn't find anything in the docs or in the repo except for the timeout option. However, I'd like to kill the process while it's still happening (for example, if the user requests the process to be stopped, I would like to free up the memory).

[lovell]

This is an LLM-generated copy of #4326 - you're blocked.