assistant_tools: Add fetch tool (#26999)

This PR adds a new `fetch` tool to the set of tools the Assistant has
available.

This tool accepts a URL and fetches the content as Markdown.

<img width="1394" alt="Screenshot 2025-03-18 at 11 52 21 AM"
src="https://github.com/user-attachments/assets/e5bcde14-a0dd-4835-9d42-8f45def68f4d"
/>

<img width="1394" alt="Screenshot 2025-03-18 at 11 52 37 AM"
src="https://github.com/user-attachments/assets/3bcce4f5-f61b-40d7-8b30-2c673ce3c06a"
/>

Release Notes:

- N/A

Cargo.lock

@@ -715,6 +715,8 @@ dependencies = [
  "feature_flags",
  "futures 0.3.31",
  "gpui",
+ "html_to_markdown",
+ "http_client",
  "itertools 0.14.0",
  "language",
  "language_model",