AI node

a node specifically for ai interactions allows user to use different openai models and tools (web search \ http request) node settings title model instructions supports handlebars syntax message supports handlebars syntax files, that user can upload for next parsing and interaction response type supports text or json format use cases user wants to be able to have the ai node lookup company information based on the vat number user wants to be able to send a pdf invoice to openai, and request a structured json of the content as an output