feat(webpack-extraction-plugin): add "classNameHashSalt" validation

[layershifter]

This pull request introduces a new feature to validate and manage the classNameHashSalt option to @griffel/webpack-extraction-plugin packages. It also ensures consistent handling of the salt in generated code and adds tests for validation.

The option can be added the loader:

module.exports = {
  module: {
    rules: [
      {
        use: {
          loader: GriffelCSSExtractionPlugin.loader,
          options: { classNameHashSalt: 'YOUR_SALT' },
        },
      },  
   ]
 }
};

The value of classNameHashSalt should match value specified for @griffel/webpack-loader.

[github-actions]

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