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/merge.rs

@@ -0,0 +1,42 @@
+use nu_test_support::fs::Stub::FileWithContentToBeTrimmed;
+use nu_test_support::playground::Playground;
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn row() {
+    Playground::setup("merge_test_1", |dirs, sandbox| {
+        sandbox.with_files(vec![
+            FileWithContentToBeTrimmed(
+                "caballeros.csv",
+                r#"
+                name,country,luck
+                Andrés,Ecuador,0
+                Jonathan,USA,0
+                Jason,Canada,0
+                Yehuda,USA,0
+            "#,
+            ),
+            FileWithContentToBeTrimmed(
+                "new_caballeros.csv",
+                r#"
+                name,country,luck
+                Andrés Robalino,Guayaquil Ecuador,1
+                Jonathan Turner,New Zealand,1
+            "#,
+            ),
+        ]);
+
+        let actual = nu!(
+            cwd: dirs.test(), pipeline(
+            r#"
+                open caballeros.csv
+                | merge { open new_caballeros.csv }
+                | where country in ["Guayaquil Ecuador" "New Zealand"]
+                | get luck
+                | math sum
+                "#
+        ));
+
+        assert_eq!(actual.out, "2");
+    })
+}