[WIP] Recipes for ICMC-ASR competition

[wd929]

Hi all,

This PR is to support the recipe for ICMC-ASR competition. Processing the IHM and SDM data, along with baseline AEC-IVA and GSS approach are included in this recipe. Preparations for the language model are also included. Besides, finetuning the multi_zh pretrained checkpoint are provided as well, which could bring further improvements. We are still working on and will release the checkpoints in the coming commits. Thanks!

Best, Wen and Yuekai