audio based normalization
This pull request **introduces 5 alerts** when merging 1c377a54d1e6839552177764d8cda01625ee4d02 into f0b3624dc1aee9670d85b82251ad4e488a622bc7 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-9e99806aca1eb1e8466bb5af4cc9ae1424e9a890)

**new alerts:**

* 4 for Unused import
* 1 for Nested loops with same variable This pull request **introduces 5 alerts** when merging a9fc90e15755844988cbcd6c7a2cb9630424c79d into 202ccc902937b10bd9a0f37d49f8b8dc29e3ca4d - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-5240fe671cd93a037439119ede238dafcdb30dfe)

**new alerts:**

* 4 for Unused import
* 1 for Wrong number of arguments in a class instantiation
Text Normalization conditioned on audio: multiple normalization options considered, the best match selected based on WER.
Python support only (no SH).