LLava next data module changes for energon and mock
State: closed | Pull request: yes

# What does this PR do ?

LLava next data module changes for energon and mock

**Collection**: [Note which collection this PR will affect]

# Changelog 
- Modified NeVA Mock data module to support llava-next
- Modified llava next sample/task encoder to include attention mask and image sizes

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation

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# 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.data.mock
nemo/collections/vlm/neva/data/mock.py:29:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/data/mock.py:79:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/data/mock.py:90:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/data/mock.py:95:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/vlm/neva/data/mock.py:100:4: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.47/10
```

---

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:

```
************* Module nemo.collections.vlm.neva.data.llava_next_energon
nemo/collections/vlm/neva/data/llava_next_energon.py:56:0: C0301: Line too long (128/119) (line-too-long)
nemo/collections/vlm/neva/data/llava_next_energon.py:57:0: C0301: Line too long (130/119) (line-too-long)
nemo/collections/vlm/neva/data/llava_next_energon.py:65:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/vlm/neva/data/llava_next_energon.py:135:0: C0115: Missing class docstring (missing-class-docstring)

-----------------------------------
Your code has been rated at 9.42/10
```

---

Thank you for improving NeMo's documentation!