use uutils/coreutils cp command in place of nushell's cp command

crates/nu-command/Cargo.toml

@@ -88,6 +88,7 @@ toml = "0.7"
 unicode-segmentation = "1.10"
 ureq = { version = "2.7", default-features = false, features = ["charset", "gzip", "json", "native-tls"] }
 url = "2.2"
+uu_cp = "0.0.21"
 uuid = { version = "1.3", features = ["v4"] }
 wax = { version = "0.5" }
 which = { version = "4.4", optional = true }

crates/nu-command/src/default_context.rs

@@ -200,10 +200,11 @@ pub fn add_shell_command_context(mut engine_state: EngineState) -> EngineState {
         // FileSystem
         bind_command! {
             Cd,
-            Cp,
             Ls,
             Mkdir,
             Mv,
+            Cp,
+            UCp,
             Open,
             Start,
             Rm,

crates/nu-command/src/filesystem/mod.rs

@@ -10,6 +10,7 @@ mod rm;
 mod save;
 mod start;
 mod touch;
+mod ucp;
 mod util;
 mod watch;
 
@@ -25,4 +26,5 @@ pub use rm::Rm;
 pub use save::Save;
 pub use start::Start;
 pub use touch::Touch;
+pub use ucp::UCp;
 pub use watch::Watch;