Add Audio PAIRS audio scenario

[ImKeTT]

This PR adds the Audio PAIRS audio scenario, which is an audio extension of the PAIRS (https://arxiv.org/abs/2402.05779) from VHELM. The dataset was created by:

1. Collecting instructions that were used for PAIRS's image generation from Table C.1, C.2, C.3 in the PAIRS paper (https://arxiv.org/abs/2402.05779).
2. Assigning four different characters for each instruction, i.e., black woman, black man, white woman, white man.
3. Using OpenAI's TTS-001-HD API (tutorial) to generate the audio files. In detail, the voice of Echo for men and the voice of Nova for women (voice options).
4. Using the original questions from PAIRS as the Audio PAIRS's questions.
5. Adding the "unclear" option as the correct answer following VHELM.

Audio samples of the data can be found here.
I'm also attaching the run_spec.json and scenario_state.json files.

run_spec_audio_pairs.json
scenario_state_audio_pairs.json