added energon dataloader for neva training
# What does this PR do ?
added megatron-energon  based datamodule for neva training

**Collection**: [Note which collection this PR will affect]
Multimodal
# Changelog 
- Energon based 



```python
from nemo.collections.multimodal.data.energon import (
    ImageToken,
    MultiModalSampleConfig,
    SimpleMultiModalDataModule,
)
processor = AutoProcessor.from_pretrained("llava-hf/llava-1.5-7b-hf")
tokenizer = processor.tokenizer
image_processor = processor.image_processor

config = MultiModalSampleConfig(
            image_token=ImageToken(token_str="<image>", token_id=-200), ignore_place_holder=-100
        )
       
data_module = SimpleMultiModalDataModule(
            path=dataset_path,
            tokenizer=tokenizer,
            image_processor=image_processor,
            num_workers=0,
            micro_batch_size=1,
            multimodal_sample_config=config,
        )
```

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