Cooperative cancellation handle for WhisperCpp.transcribe/3.
Mint a handle, pass it via the :abort_handle option, then signal it
from another process to ask in-flight inference to return early.
whisper.cpp polls the abort flag between encoder/decoder steps; the
returned %Transcription{} contains whatever segments had been
produced before the abort took effect.
Summary
Types
@type t() :: %WhisperCpp.AbortHandle{ref: reference()}