feat: add git attributes features

[seokju-na]

Closes #176

Usage:

import { openRepository } from 'es-git';

const repo = await openRepository('...');
repo.getAttr('index.js', 'text'); // 'eol'
repo.getAttr('.yarn/releases/yarn-4.9.2.cjs', 'binary'); // true

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Project	Deployment	Review	Updated (UTC)
es-git	Ready	Preview, Comment	Dec 27, 2025 4:00am