Add initial batch of into conversions

crates/nu-command/src/conversions/into/command.rs

@@ -0,0 +1,46 @@
+use nu_engine::get_full_help;
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EvaluationContext},
+    Signature, Value,
+};
+
+pub struct Into;
+
+impl Command for Into {
+    fn name(&self) -> &str {
+        "into"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("into")
+    }
+
+    fn usage(&self) -> &str {
+        "Apply into function."
+    }
+
+    fn run(
+        &self,
+        context: &EvaluationContext,
+        call: &Call,
+        _input: Value,
+    ) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
+        Ok(Value::String {
+            val: get_full_help(&Into.signature(), &[], context),
+            span: call.head,
+        })
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_examples() {
+        use crate::test_examples;
+
+        test_examples(Into {})
+    }
+}