feat(random): add random-integer and random-uuid (#440)

* feat(randome): add random-integer

* feat(random): add random-uuid

crates/nu-protocol/src/value/mod.rs

@@ -214,6 +214,17 @@ impl Value {
         }
     }
 
+    pub fn as_integer(&self) -> Result<i64, ShellError> {
+        match self {
+            Value::Int { val, .. } => Ok(*val),
+            x => Err(ShellError::CantConvert(
+                "float".into(),
+                x.get_type().to_string(),
+                self.span()?,
+            )),
+        }
+    }
+
     /// Get the span for the current value
     pub fn span(&self) -> Result<Span, ShellError> {
         match self {