put garak data all in one place

[leondz]

• ~/.garak on nix/osx
• somewhere similar on win
• print the garak.log location near run start
• make the location configurable

[jmartin-tech]

Consider using the XDG specification.

[leondz]

mid-way fix: use a dir, garak_runs/ by default, for this kind of thing 660f6fd

[leondz]

Some things to work out (thanks @jmartin-tech):

• Models (ex: huggingface cache models)
• Third party package datasets (ex: ntlk_data)
• Sane default locations not in repo path (ex: XDG standard or user path)

[leondz]

XDG looks good. Makes a tonne of sense for content garak creates, unless something like a runs/ dir is specified in e.g. _config - that's probably a config node worth adding at the same time as this change

[leondz]

• visual_jailbreak download will need to comply with this

[leondz]

• Models (ex: huggingface cache models)

Leave as default - HF uses a user-specific, not venv/conda-specific location, and data here is often large, as well as often used by other things people do

• Third party package datasets (ex: ntlk_data)

Inclined to leave as default location. We should minimise what NLTK downloads.

• Sane default locations not in repo path (ex: XDG standard or user path)

Let's definitely migrate to XDG default for everything directly created by garak (log, report jsonl, hitlog jsonl, report html). Possible config options: garak data dir; runs output dir (for all report & hitlog files); logfile path