fix partial audio transcription order:
wouldn't it be better to enable pre-sorting for partial audio instead (if possible)? Thanks for the suggestion @pzelasko, that needs a whole revamp and done that. 
But now I notice we can unify partial audio.
1. ~Canary can perform partial audio transcription when offset provided through manifest (previous assumption was no I believe looking at the code)~ -> Fixed to allow partial transcribe to be done using transcribe by default 
2. ~If 1, then we can add additional support for .transcribe() for ASR Models to support reading from manifest. Currently TranscriptioMixin supports audio, list of audio, dataloader.~ Added support for manifest file reading to TranscribeMixIn high level  
# What does this PR do ?

* Removes special case of sorting for EncDecMultiTaskModels
* Removes partial audio transcription for all Model Types
* Now transcribe_speech.py transcribes as per presence of offset and duration in manifest automatically without special conditions
* Adds support to transcriptionmixin to read manifest for transcribing on high level rather than subclasses to deal with it
* Merges NeMo 2.0 transcription usage for all Model Types

**Collection**: ASR

# Usage

```bash
python transcribe_speech.py model_path=<.nemo file> dataset_manifest=<manifest_file>
```

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