Allure Mocha: testplan support, env info and categories, metadata

[delatrie]

Context

Add test plan support to Allure Mocha.

Extra changes

• dump the environment info and categories when the test run is done
• allure metadata (labels and a shorthand for ALLURE_ID) can now be specified via a test's name. That doesn't affect testCaseId and display name:

  it("my test @allure.id:1001 @allure.label.owner:John", () => { /* ... */ });

  That's crucial for filtering by ID via a test plan.
• hook timeout was increased when testing Allure Mocha (some combinations take around 10 seconds to complete on my machine - the default hook timeout value)
• Redundant host and thread labels calculation was removed from allure-mocha. Allure-js-commons is used now.

Checklist

• Sign Allure CLA
• Provide unit tests