Move filesize to use bigint (#2984)

* Move filesize to be bigint-sized

* Add tests and fix filesize display

* clippy

tests/shell/pipeline/commands/internal.rs

@@ -750,6 +750,53 @@ fn range_with_mixed_types() {
     assert_eq!(actual.out, "55");
 }
 
+#[test]
+fn filesize_math() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+        = 100 * 10kb
+        "#
+    );
+
+    assert_eq!(actual.out, "1.0 MB");
+}
+
+#[test]
+fn filesize_math2() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+        = 100 / 10kb
+        "#
+    );
+
+    assert!(actual.err.contains("Coercion"));
+}
+
+#[test]
+fn filesize_math3() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+        = 100kb / 10
+        "#
+    );
+
+    assert_eq!(actual.out, "10.2 KB");
+}
+#[test]
+fn filesize_math4() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+        = 100kb * 5
+        "#
+    );
+
+    assert_eq!(actual.out, "512.0 KB");
+}
+
 #[test]
 fn exclusive_range_with_mixed_types() {
     let actual = nu!(