fix(utils): extend input type for formatNearAmount function

Author: denbite

.changeset/nice-nails-remain.md

@@ -0,0 +1,6 @@
+---
+"@near-js/utils": patch
+"near-api-js": patch
+---
+
+Extend input type for `formatNearAmount` function

packages/utils/src/format.ts

@@ -30,7 +30,7 @@ for (
  * @returns Value in Ⓝ
  */
 export function formatNearAmount(
-    balance: string,
+    balance: string | number | bigint,
     fracDigits: number = NEAR_NOMINATION_EXP
 ): string {
     let balanceBN = BigInt(balance);