ListStream touchup (#12524)

# Description

Does some misc changes to `ListStream`:
- Moves it into its own module/file separate from `RawStream`.
- `ListStream`s now have an associated `Span`.
- This required changes to `ListStreamInfo` in `nu-plugin`. Note sure if
this is a breaking change for the plugin protocol.
- Hides the internals of `ListStream` but also adds a few more methods.
- This includes two functions to more easily alter a stream (these take
a `ListStream` and return a `ListStream` instead of having to go through
the whole `into_pipeline_data(..)` route).
  -  `map`: takes a `FnMut(Value) -> Value`
  - `modify`: takes a function to modify the inner stream.

crates/nu-cmd-extra/src/extra/filters/each_while.rs

@@ -87,7 +87,7 @@ impl Command for EachWhile {
                         Err(_) => None,
                     })
                     .fuse()
-                    .into_pipeline_data(engine_state.ctrlc.clone()))
+                    .into_pipeline_data(head, engine_state.ctrlc.clone()))
             }
             PipelineData::ExternalStream { stdout: None, .. } => Ok(PipelineData::empty()),
             PipelineData::ExternalStream {
@@ -108,7 +108,7 @@ impl Command for EachWhile {
                         }
                     })
                     .fuse()
-                    .into_pipeline_data(engine_state.ctrlc.clone()))
+                    .into_pipeline_data(head, engine_state.ctrlc.clone()))
             }
             // This match allows non-iterables to be accepted,
             // which is currently considered undesirable (Nov 2022).

crates/nu-cmd-extra/src/extra/filters/update_cells.rs

@@ -108,7 +108,7 @@ impl Command for UpdateCells {
             columns,
             span: head,
         }
-        .into_pipeline_data(engine_state.ctrlc.clone())
+        .into_pipeline_data(head, engine_state.ctrlc.clone())
         .set_metadata(metadata))
     }
 }

crates/nu-cmd-extra/src/extra/strings/format/command.rs

@@ -238,10 +238,7 @@ fn format(
                 }
             }
 
-            Ok(PipelineData::ListStream(
-                ListStream::from_stream(list.into_iter(), None),
-                None,
-            ))
+            Ok(ListStream::new(list.into_iter(), head_span, engine_state.ctrlc.clone()).into())
         }
         // Unwrapping this ShellError is a bit unfortunate.
         // Ideally, its Span would be preserved.