Use vitest for benchmarks

[Minhir]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the benchmarking system from the legacy benchmark package to Vitest's built-in benchmarking capabilities. The change modernizes the benchmark setup, adds new comparison libraries, and consolidates the benchmark configuration into the main project structure.

• Replaced the Node.js-based benchmark runner with Vitest's bench API
• Added faker for more comprehensive random data generation
• Updated the benchmark methodology to test multiple operations (write, read, update, has, delete) across different dataset sizes

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Added bench script, updated vitest to v4, added benchmark dependencies to devDependencies
biome.json	Expanded file includes pattern to cover nested directories while excluding build outputs
benchmark/package.json	Removed standalone benchmark package configuration
benchmark/maps.bench.ts	New comprehensive benchmark suite using Vitest with multiple operations and dataset sizes
benchmark/index.js	Removed legacy benchmark implementation
benchmark/.gitignore	Removed as benchmark directory no longer has its own node_modules
README.md	Simplified benchmark documentation, removed detailed tables in favor of referencing the source file

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