remove --column from length command and remove record processing (#10091)

# Description

This PR removes `record` processing from the `length` command. It just
doesn't make sense to try and get the length of a record. This PR also
removes the `--column` parameter. If you want to list or count columns,
you could use `$table | columns` or `$table | columns | length`.

close #10074 

### Before

![image](https://github.com/nushell/nushell/assets/343840/83488316-3ec4-4c32-9583-00341a71f46f)

### After
Catches records two different ways now.
with the `input_output_types` checker

![image](https://github.com/nushell/nushell/assets/343840/ca67f8b6-359e-4933-ab4d-1b702f8d79cf)

and with additional logic in the command for cases like `echo`

![image](https://github.com/nushell/nushell/assets/343840/99064351-b208-4bd3-bab9-535f97cd7ad4)


# User-Facing Changes
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# Tests + Formatting
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crates/nu-command/tests/commands/first.rs

@@ -40,9 +40,10 @@ fn gets_first_row_when_no_amount_given() {
     Playground::setup("first_test_3", |dirs, sandbox| {
         sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
 
-        let actual = nu!(cwd: dirs.test(), "ls | first | length");
+        // FIXME: We should probably change first to return a one row table instead of a record here
+        let actual = nu!(cwd: dirs.test(), "ls | first | values | length");
 
-        assert_eq!(actual.out, "1");
+        assert_eq!(actual.out, "4");
     })
 }
 

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

@@ -33,9 +33,10 @@ fn gets_last_row_when_no_amount_given() {
     Playground::setup("last_test_2", |dirs, sandbox| {
         sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
 
-        let actual = nu!(cwd: dirs.test(), "ls | last | length");
+        // FIXME: We should probably change last to return a one row table instead of a record here
+        let actual = nu!(cwd: dirs.test(), "ls | last | values | length");
 
-        assert_eq!(actual.out, "1");
+        assert_eq!(actual.out, "4");
     })
 }
 

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

@@ -2,14 +2,21 @@ use nu_test_support::nu;
 
 #[test]
 fn length_columns_in_cal_table() {
-    let actual = nu!("cal | length -c");
+    let actual = nu!("cal | columns | length");
 
     assert_eq!(actual.out, "7");
 }
 
 #[test]
 fn length_columns_no_rows() {
-    let actual = nu!("echo [] | length -c");
+    let actual = nu!("echo [] | length");
 
     assert_eq!(actual.out, "0");
 }
+
+#[test]
+fn length_fails_on_echo_record() {
+    let actual = nu!("echo {a:1 b:2} | length");
+
+    assert_eq!(actual.err.contains("only_supports_this_input_type"), true);
+}