Create dataset loader for AlloVera

[SamuelCahyawijaya]

Dataloader name: allovera/allovera.py
DataCatalogue: http://seacrowd.github.io/seacrowd-catalogue/card.html?allovera

Dataset	allovera
Description	AlloVera, which provides mappings from 218 allophones to phonemes for 14 languages. Phonemes are contrastive phonological units, and allophones are their various concrete realizations, which are predictable from phonological context.
Subsets	javanese, tagalog, vietnamese
Languages	jav, tgl, vie
Tasks	Automatic Speech Recognition
License	MIT (mit)
Homepage	https://github.com/dmort27/allovera
HF URL	-
Paper URL	https://aclanthology.org/2020.lrec-1.656