Add "_skipme" option to Lhotse Dataloading
State: open | Pull request: yes
Labels: name: common

# What does this PR do ?

Lhotse Dataloading will ignore samples where "_skipme" is set to 1 if not instructed otherwise with `ds.ignore_skipme=True`

**Collection**: [common]

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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# 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**:
- [ ] 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)


<!-- pylint-output-strict-mode-false -->

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module nemo.collections.common.data.lhotse.cutset
nemo/collections/common/data/lhotse/cutset.py:629:0: C0301: Line too long (139/119) (line-too-long)
nemo/collections/common/data/lhotse/cutset.py:65:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/common/data/lhotse/cutset.py:204:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:225:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:240:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:259:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:274:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:290:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:297:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:343:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:440:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/common/data/lhotse/cutset.py:489:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.51/10
```

---

Mitigation guide:

* Add sensible and useful docstrings to functions and methods
* For trivial methods like getter/setters, consider adding `# pylint: disable=C0116` inside the function itself
* To disable multiple functions/methods at once, put a `# pylint: disable=C0116` before the first and a `# pylint: enable=C0116` after the last.

By applying these rules, we reduce the occurance of this message in future.

Thank you for improving NeMo's documentation!