feat: setup basic snapshot test for gas stats

[schaable]

This PR adds basic snapshot testing for gas statistics. Ideally we'd use something like Jest snapshots, but I avoided adding dependencies due to recent npm security issues. I'll revisit this approach when we implement gas stats for Solidity tests, since we'll need snapshot testing there as well. the combined gas statistics table.

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[Copilot]

Pull Request Overview

This PR implements basic snapshot testing for gas usage statistics to track and validate gas consumption in smart contract tests. The author chose a custom implementation to avoid adding external dependencies due to security concerns, with plans to revisit for Solidity tests.

• Adds a custom snapshot testing system that captures gas statistics from Hardhat test runs
• Creates comprehensive test suites for Counter and Calculator contracts to generate gas usage data
• Integrates snapshot testing into the project's test workflow

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
v-next/example-project/test/snapshot-test.js	Implements custom snapshot testing functionality for gas statistics
v-next/example-project/test/node/counter.ts	Adds Node.js test suite for Counter contract with various gas-consuming operations
v-next/example-project/test/node/calculator.ts	Adds Node.js test suite for Calculator contract with comprehensive operation coverage
v-next/example-project/package.json	Updates test scripts to include snapshot testing commands
v-next/example-project/contracts/Counter.sol	Enhances Counter contract with additional functions for comprehensive gas testing
v-next/example-project/contracts/Calculator.sol	Adds new Calculator contract with arithmetic operations for gas testing
v-next/example-project/.snapshots/gas-stats	Creates initial gas statistics snapshot file
v-next/config/.prettierignore	Excludes snapshot directory from Prettier formatting

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