Build npm Package: @near-js/nft-utils - NFT Utilities

Description

## Overview
Create an npm package with utilities for working with NEAR NFTs - metadata parsing, collection handling, and marketplace integration.

## Why This Matters
NFT handling has many edge cases. A utilities package handles the complexity.

## Technical Requirements

### NFT Utilities
```typescript
import { parseMetadata, validateNFT, getCollection } from '@near-js/nft-utils';

const metadata = await parseMetadata(contractId, tokenId);
const isValid = validateNFT(metadata, 'NEP-171');
const collection = await getCollection(contractId);
```

## Deliverables
1. **NFT utilities package**
2. **Metadata parsing**
3. **Validation tools**
4. **Marketplace helpers**

## Budget: 6 NEAR

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