Better Intelligibility metric for CAD2 Task1 into main

[groadabike]

In CAD2 task1, the original intelligibility metric was using whisper for transcription and jiwer for computing correctness.
However, jiwer was used without any normalisation resulting in lower score.
For example, capitalised vs non-capitalised words, punctuations not excluded.

The changes are:

• Replace jiwer by alt-eval which performs several normalisation before calling jiwer.
• Add verbose option True or False for MSGB HL model to reduce unnecessary prints. Warnings will still be printed regardless the verbose option.

[groadabike]

@jonbarker68
This PR is bringing the updates done in version 0.6.2 to the main branch