LoRA finetune recipe

[Amirjab21]

Why?

Add a recipe so that people can easily get started with finetuning the model using parameter efficient fine-tuning. This allows people to finetune the model on consumer hardware.

How ?

I built a custom LoRA implementation as other libraries did not support the fairseq2 modules used in omnilingual-asr.
I also used a public dataset to show an example of this training recipe for finetuning the model for an Arabic dialect.

Test plan

The script can be run on most consumer devices and you can see the performance of the model improving.
I wrote some tests to verify that the LoRA implementation works as expected but did not include this in this PR. I can add if necessary.

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