UPDATE: Adds 56 functions in the Statistical section

Uses statrs for numerical functions

REFACTOR: Put statistical functions on its own module

This might seem counter-intuitive but the wasm build after this refactor
is 1528 bytes smaller :)

base/src/test/statistical/test_fn_devsq.rs

@@ -0,0 +1,50 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments_smoke_test() {
+    let mut model = new_empty_model();
+    model._set("A1", "=DEVSQ()");
+    model._set("A2", "=DEVSQ(1, 2, 3)");
+    model._set("A3", "=DEVSQ(1, )");
+    model._set("A4", "=DEVSQ(1,   , 3)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"2");
+    assert_eq!(model._get_text("A3"), *"0");
+    assert_eq!(model._get_text("A4"), *"2");
+}
+
+#[test]
+fn ranges() {
+    let mut model = new_empty_model();
+    model._set("A1", "=DEVSQ(A2:A8)");
+    model._set("A2", "4");
+    model._set("A3", "5");
+    model._set("A4", "8");
+    model._set("A5", "7");
+    model._set("A6", "11");
+    model._set("A7", "4");
+    model._set("A8", "3");
+    model.evaluate();
+    assert_eq!(model._get_text("A1"), *"48");
+}
+
+#[test]
+fn arrays() {
+    let mut model = new_empty_model();
+    model._set("A1", "=DEVSQ({1, 2, 3})");
+    model._set("A2", "=DEVSQ({1; 2; 3})");
+    model._set("A3", "=DEVSQ({1, 2; 3, 4})");
+    model._set("A4", "=DEVSQ({1, 2; 3, 4; 5, 6})");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"2");
+    assert_eq!(model._get_text("A2"), *"2");
+    assert_eq!(model._get_text("A3"), *"5");
+    assert_eq!(model._get_text("A4"), *"17.5");
+}