v0.3.0

Enhancements:

• The resolver_prompt function now provides clearer instructions for the resolver role including special marker <|answerstart|> for the start of the final completion. This allow everything before that to be trimmed.
• Added two new functions, extract_completions/1 and extract_completion/1, for extracting the content of completions from a list.
• Added a new function, prepare_completion_options/1, that takes a list of completions and prepares them as answer options.
• Improved the documentation of all functions and added examples. This enhancement makes it easier for other developers to understand and use the functions.