Add array concatenation

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/value.rs

@@ -5,6 +5,8 @@ use std::collections::BTreeMap;
 use displaydoc::Display;
 use thiserror::Error;
 
+use crate::Nomo;
+
 #[derive(Clone)]
 pub enum NomoValue {
     String {
@@ -122,6 +124,11 @@ impl NomoValue {
                     value: Cow::Owned(format!("{rstr}{lstr}")),
                 })
             }
+            (NomoValue::Array { value: lval }, NomoValue::Array { value: rval }) => {
+                Some(NomoValue::Array {
+                    value: Vec::from_iter(lval.iter().chain(rval.iter()).cloned()),
+                })
+            }
             _ => None,
         }
     }