generators: move read timeout up to global/base.Generator config item

[leondz]

Currently the read timeout is hard-coded a bunch of places, and not configurable. Instead, generator read timeout should be configurable.

[ls-omar-nbou]

Hi @leondz, glad I found this issue since I was about to create one (seems also to be related to this one -> #448 ). I have started to use this great framework for the past few days and this is an annoying issue especially for REST generators. It would be great to be able to configure that via a parameter.

Keep up the great work.

[ls-omar-nbou]

I was able to fix the issue using the parameter request_timeout documented in here https://reference.garak.ai/en/latest/garak.generators.rest.html via a JSON definition into a file and pass the filename to --generator_option_file.
{ "rest": { "RestGenerator": { "name": "Chatbot test", "uri": "<URL_PATH>", "method": "post", "headers": { "Authorization": "Bearer <TOKEN>", "Content-Type": "application/json" }, "req_template_json_object": { "api_provider":"groq", "chat_history":[{"role":"user","content":"$INPUT"}] }, "response_json": true, "response_json_field": "message", **"request_timeout": 180** } } }