feat: add store export

[noomorph]

This pull request introduces a new, more intuitive way to work with Allure test results in the new jest-allure2-reporter/store export.

Instead of juggling multiple low-level utilities, you now have simple, high-level tools to read and write Allure data.

Highlights:

• AllureStore: A central class that lets you manage your Allure data in one place.
• AllureReader & AllureWriter: Streamlined interfaces for fetching and saving results. They’re flexible, so you can plug in custom solutions or stick to the defaults.
• fromConfig & fromDirectory: Easy-to-use factory functions that let you set up an AllureStore quickly, either from a configuration or directly from a results directory.

Why This Matters:

These changes give you a clearer, more direct way to interact with Allure results. By consolidating complexity into a few well-defined entry points, you’ll spend less time configuring and more time working with the data you care about.