Feat/ai targets and toolsets

[domantas-jurkus-dcd]

In this MR:

• Add tools: chatgpt, perplexity.
• Make each tool belong to a toolset. Current toolset setup:

| Toolset        | Tools                                        |
| -------------- | -------------------------------------------- |
| `web`          | `scrape_as_markdown`, `google_search_parsed`  |
| `ecommerce`    | `amazon_search_parsed`                        |
| `social_media` | `reddit_post`, `reddit_subreddit`             |
| `ai`           | `chatgpt`, `perplexity`                       |

• Add tests.