Build PyPI Package: near-testing - Contract Testing Utils

Description

## Overview
Create a Python testing utilities package for NEAR smart contracts, complementing near-workspaces.

## Why This Matters
Python developers need Python testing tools. This package provides pytest integration and helpers.

## Technical Requirements

### Testing Utilities
```python
import pytest
from near_testing import sandbox, account, deploy

@pytest.fixture
def contract(sandbox):
return deploy(sandbox, "contract.wasm")

def test_transfer(contract, account):
result = contract.call("transfer", {"to": account.id, "amount": "100"})
assert result.is_success
```

## Deliverables
1. **Testing utilities package**
2. **Pytest integration**
3. **Sandbox helpers**
4. **Documentation**

## Budget: 6 NEAR

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