Add Casual Conversation V2 audio scenario

[ImKeTT]

1. Fix scenario subset name errors in the audio_run_specs.py
2. Add missing tags to multilinguality scenarios
3. Add the Casual Conversation V2 scenario

The Casual Conversation V2 dataset is quite large, with 80 .zip files totaling 30-60GB per file. We'll need to download and unzip it manually into the folder.

For the age and gender classification tasks, I adjusted them to a multiple-choice format.

• For age classification, while most speakers have specific ages, it’s difficult for current audioLLMs to recognize them accurately. So I grouped the ages into four ranges: "18-30", "31-50", "51+", and "others."
• For gender classification, which originally had six categories, I simplified it into three options: "male", "female", and "others."

I'm attaching the scenario_state.json files

scenario_state_ccv2_age.json
scenario_state_ccv2_gender.json