Version 0.2.0 (2022-10-28)

Update upstream whisper.cpp to 2c281d190b7ec351b8128ba386d110f100993973.
Fix breaking changes in update, which cascade to users:
- DecodeStrategy has been renamed to SamplingStrategy
- WhisperContext::sample_best's signature has changed: needs_timestamp has been removed.
New features
- WhisperContext::full_n_tokens
- WhisperContext::full_get_token_text
- WhisperContext::full_get_token_id
- WhisperContext::full_get_token_prob