WIP Fix for #4455
# What does this PR do ?

Proposed fix for #4455

**Collection**: asr, common

# Changelog 
- [Plumb is_tar_manifest throughout dataset code.](https://github.com/NVIDIA/NeMo/commit/b1bc3ab190cbb1e24898cd2af6ff84e2425f69d7)
- [Fix for KeyError.](https://github.com/NVIDIA/NeMo/commit/653d4d755d0132d640305017336ddbf612705aeb)
# Usage

This allow for running ASR training on tar files with keys containing "/".

is_tar_manifest needs to be plumbed through all possible parse_func's in usage today.

# 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 #4455
