Add config to make --dry-run default

[DavidDworetzky]

In environments where I might be recommending this tool to others - I'd feel better having the safer option be the default. Is there a setting for this currently, or would we have to add a flag/config?

[biobootloader]

We could add a default_dry_run optional flag to the config!

[granawkins]

With #59, you can now set dry-run to default by modifying ~/.rawdog.config.yaml, after you've opened rawdog once and generated it. e.g:

llm_api_key: ...
llm_base_url: https://api.openai.com/v1
llm_custom_provider: null
llm_model: gpt-4-turbo
llm_temperature: '1'
dry_run: True