Add same config file resolution as `cz-cli`

[kykungz]

Currently, git-cz already has its own configuration file resolution:

git-cz/lib/getConfig.js

Lines 7 to 12 in e02bcb1

	const configFiles = [
	'.git-cz.json',
	'changelog.config.js',
	'changelog.config.cjs',
	'changelog.config.json'
	];

And also able to resolve commitizen config via config.commitizen.changelog in package.json:

git-cz/lib/getConfig.js

Lines 27 to 38 in e02bcb1

	const pkgFilename = path.join(dir, 'package.json');
	if (fs.existsSync(pkgFilename)) {
	try {
	const changelog = require(pkgFilename).config.commitizen.changelog;
	if (changelog) {
	return changelog;
	}
	// eslint-disable-next-line no-empty
	} catch (error) {}
	}

So it is already playing quite nice with commitizen's config, meaning we don't need to have an extra .git-cz.json or changelog.config.js file in our repository, as all git-cz configs can be stored alongside with commitizen config in package.json.

However, when we want to use commitizen globally, the convention is to use .czrc or .cz.json file in $HOME directory, which isn't supported in git-cz.

So I'm wondering if we could do the same with package.json by also recursively reading .czrc and .cz.json like what commitizen does?