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-command/src/database/commands/into_sqlite.rs

@@ -203,8 +203,8 @@ fn action(
     ctrl_c: Option<Arc<AtomicBool>>,
 ) -> Result<Value, ShellError> {
     match input {
-        PipelineData::ListStream(list_stream, _) => {
-            insert_in_transaction(list_stream.stream, span, table, ctrl_c)
+        PipelineData::ListStream(stream, _) => {
+            insert_in_transaction(stream.into_iter(), span, table, ctrl_c)
         }
         PipelineData::Value(
             Value::List {