Move script to nu engine (#3092)

* Move run_script to engine

* Add which dep and feature to engine

* Change unwrap to expect

* Add wasm specification

* Remove which from default, add specification correctly

* Add nu-platform-specifics

* Move is_external_cmd to platform_specifics

* Add is_external_cmd to host and use it instead of nu_platform directly

* Clean up if else logic in is_external_cmd

* Bump nu-platform-specifics version

* Pass context to print_err

* Commit cargo.lock

* Move print functions to own module inside nu-engine

* Hypocratic change to run windows-nightly again

* Add import for Ordering

* Move printing of error to host

* Move platform specific which functionality to basic host

* Allow no use of cmd_name

* Fix windows compile issue

crates/nu-cli/src/line_editor.rs

@@ -5,7 +5,7 @@ use std::error::Error;
 use crate::prelude::*;
 
 #[allow(unused_imports)]
-use nu_command::script::LineResult;
+use nu_engine::script::LineResult;
 
 #[cfg(feature = "rustyline-support")]
 use crate::shell::Helper;