Add a mvn command to generate single file report

[MahmoudElSharkawy]

It would be a big addition to the plugin if we are able to generate the single file report from the allure-maven plugin directly as It was already introduced here https://github.com/allure-framework/allure2/pull/2072

The request is to add a new command to generate single file report, can be something like this: mvn allure:single-report