Adding LLava-Next model class
State: closed | Pull request: yes
Labels: name: Run CICD

# What does this PR do ?
Adding LLava-Next model class


**Collection**:
VLM

# Changelog 
- Model class for Llava-next.
- HF Importer class for llava-next.
- Utility functions supporting image tiling and feature merging


# GitHub Actions CI

The Jenkins CI system has been replaced by GitHub Actions self-hosted runners.

The GitHub Actions CI will run automatically when the "Run CICD" label is added to the PR.
To re-run CI remove and add the label again.
To run CI on an untrusted fork, a NeMo user with write access must first click "Approve and run".

# 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)


<!-- 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.vlm.neva.model.llava
nemo/collections/vlm/neva/model/llava.py:108:0: C0301: Line too long (137/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:109:0: C0301: Line too long (122/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:110:0: C0301: Line too long (146/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:111:0: C0301: Line too long (144/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:149:0: C0301: Line too long (128/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:150:0: C0301: Line too long (161/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:151:0: C0301: Line too long (157/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:152:0: C0301: Line too long (150/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:153:0: C0301: Line too long (146/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:154:0: C0301: Line too long (158/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:155:0: C0301: Line too long (154/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:156:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:157:0: C0301: Line too long (131/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:158:0: C0301: Line too long (135/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:159:0: C0301: Line too long (131/119) (line-too-long)
nemo/collections/vlm/neva/model/llava.py:41:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/model/llava.py:46:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/model/llava.py:59:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/model/llava.py:71:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/model/llava.py:83:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/model/llava.py:105:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/model/llava.py:180:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/model/llava.py:186:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/model/llava.py:226:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 8.00/10
```

---

Thank you for improving NeMo's documentation!

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

beep boop 🤖: 🚨 The following files must be fixed before merge!

---

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

```

------------------------------------
Your code has been rated at 10.00/10
```

---

Thank you for improving NeMo's documentation!

[🤖]: Hi @yashaswikarnati 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12036965567) for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g