add new quantization nodes in QuartzNet
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* 4 for Unused import This PR requires a significant refactor - and does not need to add explicit global support for quantization in the constructor. If you would agree to it, could I push some changes to this branch directly ? > This PR requires a significant refactor - and does not need to add explicit global support for quantization in the constructor. If you would agree to it, could I push some changes to this branch directly ?

Thanks @titu1994 , I do not know other ways to pass the quantization flag from the upper script to model, please help me to refactor the code, thanks! Sounds good, thanks for the go ahead. @okuchaiev for review regarding core ModelPT changes to support 1) returning of config instead of model 2) overriding config with either str path or with OmegaConf object This pull request **introduces 4 alerts** when merging de1f57db1a375b8a6972b07d5c870c7ec6467fc0 into 8a26496f415386f50adcead21ebd1e4a21a7ff42 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-7df2249de95d719f81c51b4c2cbecf9f9508e2bf)

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* 4 for Unused import This pull request **introduces 4 alerts** when merging 033b96296c5b72f82491fda49feb0cd03364c27f into 8a26496f415386f50adcead21ebd1e4a21a7ff42 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-ef25758a3207343c34dd3975db75604fa7f111b5)

**new alerts:**

* 4 for Unused import This pull request **introduces 4 alerts** when merging 33d0c11416a0b2b02b8406a02bddb9b1dfd5490e into 8a26496f415386f50adcead21ebd1e4a21a7ff42 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-dab7b7231360f2ca3eacc5b1952a1d6341c63373)

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* 4 for Unused import This pull request **introduces 4 alerts** when merging e542e45a3c616fa1b5b03ba30d1768df148bd9a5 into 8a26496f415386f50adcead21ebd1e4a21a7ff42 - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-dd5e821caa2ca951023a3d81be5b4b2f4dffaa53)

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