Add posibility to allure_robotframework listener to send "broken" test status to allure

#### I'm submitting a ...
- [ ] feature request

#### What is the current behavior?
Currently allure_robotframework listener can send just four statuses to Allure - PASSED, FAILED, SKIPPED, UNKOWN (only in failure case), those are hardcoded in `get_allure_status` function.

#### What is the expected behavior?
Add possibility to send other test statuses, for example, BROKEN that actually in the default allure statuses list.

#### What is the motivation / use case for changing the behavior?
In my case we need to divide failed cases by different statuses on allure(failed for usual failures and broken for known cases with opened issues)

#### Please tell us about your environment:

allure-python-commons 2.13.2
allure-robotframework 2.13.2

Inizia con la funzione get_allure_status del listener allure_robotframework, dove le mappature attuali PASSED, FAILED, SKIPPED e UNKNOWN sono descritte come codificate staticamente. Traccia il percorso con cui lo stato restituito raggiunge Allure, quindi verifica che un errore in un caso noto possa produrre BROKEN mentre gli stati esistenti rimangono invariati.

Scritto dal modello di indicizzazione a partire dal testo della issue.