[FR] Add "xcresults export" as an optional step to allurectl-action for Xcode projects

[testableapple]

Hi there, thanks for this action!

We are working on an iOS project. We use allurectl and xcresults as two separate standalone command-line tools to upload test results to Allure TestOps.

Would be great if allurectl-action contained xcresults at least as an optional feature so we won't need to install and use it separately.

Thanks!