Split blocks and closures (#7075)

* Split closures and blocks

* Tests mostly working

* finish last fixes, passes all tests

* fmt

crates/nu-command/src/database/commands/into_sqlite.rs

@@ -263,6 +263,7 @@ fn nu_value_to_string(value: Value, separator: &str, config: &Config) -> String
             .collect::<Vec<_>>()
             .join(separator),
         Value::Block { val, .. } => format!("<Block {}>", val),
+        Value::Closure { val, .. } => format!("<Closure {}>", val),
         Value::Nothing { .. } => String::new(),
         Value::Error { error } => format!("{:?}", error),
         Value::Binary { val, .. } => format!("{:?}", val),