allow last to work with ranges (#11906)

# Description

This PR allows `last` to work with ranges in the same way that `first`
does. It also adds a couple examples demonstrating it.

# User-Facing Changes
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crates/nu-command/src/filters/first.rs

@@ -69,6 +69,11 @@ impl Command for First {
                 example: "0x[01 23 45] | first 2",
                 result: Some(Value::binary(vec![0x01, 0x23], Span::test_data())),
             },
+            Example {
+                description: "Return the first item of a range",
+                example: "1..3 | first",
+                result: Some(Value::test_int(1)),
+            },
         ]
     }
 }

crates/nu-command/src/filters/last.rs

@@ -27,6 +27,7 @@ impl Command for Last {
                     Type::Any,
                 ),
                 (Type::Binary, Type::Binary),
+                (Type::Range, Type::Any),
             ])
             .optional(
                 "rows",
@@ -60,6 +61,11 @@ impl Command for Last {
                 description: "Return the last 2 bytes of a binary value",
                 result: Some(Value::binary(vec![0x23, 0x45], Span::test_data())),
             },
+            Example {
+                example: "1..3 | last",
+                description: "Return the last item of a range",
+                result: Some(Value::test_int(3)),
+            },
         ]
     }