nu-cli refactor moving commands into their own crate nu-command (#2910)

* move commands, futures.rs, script.rs, utils

* move over maybe_print_errors

* add nu_command crate references to nu_cli

* in commands.rs open up to pub mod from pub(crate)

* nu-cli, nu-command, and nu tests are now passing

* cargo fmt

* clean up nu-cli/src/prelude.rs

* code cleanup

* for some reason lex.rs was not formatted, may be causing my error

* remove mod completion from lib.rs which was not being used along with quickcheck macros

* add in allow unused imports

* comment out one failing external test; comment out one failing internal test

* revert commenting out failing tests; something else might be going on; someone with a windows machine should check and see what is going on with these failing windows tests

* Update Cargo.toml

Extend the optional features to nu-command

Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>

crates/nu-command/tests/commands/wrap.rs

@@ -0,0 +1,61 @@
+use nu_test_support::fs::Stub::FileWithContentToBeTrimmed;
+use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn wrap_rows_into_a_row() {
+    Playground::setup("wrap_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name,last_name
+                Andrés,Robalino
+                Jonathan,Turner
+                Yehuda,Katz
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from csv
+                | wrap caballeros
+                | get caballeros
+                | nth 0
+                | get last_name
+            "#
+        ));
+
+        assert_eq!(actual.out, "Robalino");
+    })
+}
+
+#[test]
+fn wrap_rows_into_a_table() {
+    Playground::setup("wrap_test_2", |dirs, sandbox| {
+        sandbox.with_files(vec![FileWithContentToBeTrimmed(
+            "los_tres_caballeros.txt",
+            r#"
+                first_name,last_name
+                Andrés,Robalino
+                Jonathan,Turner
+                Yehuda,Katz
+            "#,
+        )]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open los_tres_caballeros.txt
+                | from csv
+                | get last_name
+                | wrap caballero
+                | nth 2
+                | get caballero
+            "#
+        ));
+
+        assert_eq!(actual.out, "Katz");
+    })
+}