Accelerate `transcribe_speech.py` for short-form data: pre-sorting support
jenkins jenkins jenkins jenkins jenkins jenkins jenkins
# What does this PR do ?

Adds manifest pre-sorting option (new default) ~and options to enable and control dynamic bucketing for inference~.
Depending on data distribution, pre-sorting can significantly increase inference speed (we observed as much as 2.5x throughput). ~Bucketing is approximate so expect smaller gains (we observed 1.7-2x increase in throughput depending on the model and decoding algorithm selection).~

EDIT: I removed bucketing support after realizing it'd require another refactoring of transcribe internals to be able to restore the original order. 

Also fixes a bug in processing manifests for multi task AED models (we can now override text/lang fields from transcribe_speech CLI)

**Collection**: ASR

# Changelog 
- Accelerate `transcribe_speech.py` for short-form data: pre-sorting support

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

# Jenkins CI
To run Jenkins, a NeMo User with write access must comment `jenkins` on the PR.

# Before your PR is "Ready for review"
**Pre checks**:
- [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?

Anyone in the community is free to review the PR once the checks have passed. 
[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Related to # (issue)
