feat: add weekday fn to helpers

packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/helpers/formulaFnHelper.ts

@@ -0,0 +1,25 @@
+export function getWeekdayByText(v: string) {
+  const m = {
+    monday: 0,
+    tuesday: 1,
+    wednesday: 2,
+    thursday: 3,
+    friday: 4,
+    saturday: 5,
+    sunday: 6,
+  };
+  return m[v?.toLowerCase() || 'monday'];
+}
+
+export function getWeekdayByIndex(idx: number): string {
+  const m = {
+    0: 'monday',
+    1: 'tuesday',
+    2: 'wednesday',
+    3: 'thursday',
+    4: 'friday',
+    5: 'saturday',
+    6: 'sunday',
+  };
+  return m[idx || 0];
+}