chore: added formatUtils and moved getIntervalStr and formatAmount to it

shared/utils/cusEntUtils/balanceUtils/cusEntToStartingBalance.ts

@@ -0,0 +1,25 @@
+import type { FullCusEntWithFullCusProduct } from "../../../models/cusProductModels/cusEntModels/cusEntWithProduct";
+import {
+	cusEntToCusPrice,
+	entToOptions,
+} from "../../productUtils/convertUtils";
+import { getStartingBalance } from "../getStartingBalance";
+
+export const cusEntToStartingBalance = ({
+	cusEnt,
+}: {
+	cusEnt: FullCusEntWithFullCusProduct;
+}) => {
+	const cusPrice = cusEntToCusPrice({ cusEnt });
+	const price = cusPrice?.price;
+	const options = entToOptions({
+		ent: cusEnt.entitlement,
+		options: cusEnt.customer_product.options,
+	});
+
+	return getStartingBalance({
+		entitlement: cusEnt.entitlement,
+		options,
+		relatedPrice: price,
+	});
+};