[Data] Improve error message when reading HTTP files (ray-project#40462)

If you try to read HTTP files with Ray Data, you get this error message if fsspect[http] isn't installed:

> Please install fsspec to read files from HTTP.

This PR updates the error message to clarify that you need the http extra:

> To read files from HTTP, run pip install fsspec[http].

Signed-off-by: Balaji Veeramani <[email protected]>

python/ray/data/datasource/file_based_datasource.py

@@ -718,7 +718,7 @@ def _resolve_paths_and_filesystem(
                         from fsspec.implementations.http import HTTPFileSystem
                     except ModuleNotFoundError:
                         raise ImportError(
-                            "Please install fsspec to read files from HTTP."
+                            "To read files from HTTP, run `pip install fsspec[http]`."
                         ) from None
 
                     resolved_filesystem = PyFileSystem(FSSpecHandler(HTTPFileSystem()))