feat(sdk-core): export computeZksyncCreate2Address from index (#40)

## Description

From v3-sdk PR Github CI [run](https://github.com/Uniswap/sdks/runs/25917491725), I see it cannot find the computeZksyncCreate2Address function from the sdk-core module. I think we have to explicitly export it via index file

## How Has This Been Tested?

Manual

## Are there any breaking changes?

No

## (Optional) Feedback Focus

No

## (Optional) Follow Ups

No

sdks/sdk-core/src/utils/index.ts

@@ -1,4 +1,5 @@
 export { computePriceImpact } from './computePriceImpact'
+export { computeZksyncCreate2Address } from './computeZksyncCreate2Address'
 export { sortedInsert } from './sortedInsert'
 export { sqrt } from './sqrt'
 export { validateAndParseAddress } from './validateAndParseAddress'