Setting params.initial_prompt to too many tokens should make whisper_full fail instead of throwing an exception

[sindresorhus]

I cannot really catch exceptions in Swift.

There could be some check here instead and then return a status code:

whisper.cpp/whisper.cpp

Line 5080 in de4d067

prompt_tokens.resize(whisper_tokenize(ctx, params.initial_prompt, prompt_tokens.data(), prompt_tokens.size()));

Currently, it throws an exception at this line.