[SDK] add two new utilities toEther and toWei

.changeset/witty-birds-hang.md

@@ -0,0 +1,5 @@
+---
+"@thirdweb-dev/sdk": major
+---
+
+Add new utilies toEther, toWei, toUnits and formatUnits

packages/sdk/src/evm/common/currency.ts

@@ -192,3 +192,22 @@ export async function normalizeAmount(
   const decimals = await contractWrapper.readContract.decimals();
   return utils.parseUnits(AmountSchema.parse(amount), decimals);
 }
+
+export function toEther(amount: Amount): string {
+  return utils.formatEther(AmountSchema.parse(amount));
+}
+
+export function toWei(amount: BigNumber | string): BigNumber {
+  return utils.parseEther(AmountSchema.parse(amount));
+}
+
+export function toUnits(amount: Amount, decimals: number): BigNumber {
+  return utils.parseUnits(AmountSchema.parse(amount), decimals);
+}
+
+export function formatUnits(
+  amount: BigNumber | string,
+  decimals: number,
+): string {
+  return utils.formatUnits(AmountSchema.parse(amount), decimals);
+}