Iwslt 2022 dialect

[m-wiesner]

Adds recipe for Tunisian Dialect data used in the iwslt2022 dialectal speech translation task.

[pzelasko]

Smart trick, but as a user I would be extremely surprised if importing Lhotse triggered a pip install command. Please handle missing optional dependencies in the same way as throughout the rest of the code, see e.g. here:

lhotse/lhotse/recipes/gigaspeech.py

Lines 38 to 43 in 933fb64

	if is_module_available("speechcolab"):
	from speechcolab.datasets.gigaspeech import GigaSpeech
	else:
	raise ImportError(
	"To process the GigaSpeech corpus, please install optional dependency: pip install speechcolab"
	)