Move FP8 TE export logic to mcore.export
Please fill in the MR **Usage** section with details on `fp8_quantized` & `fp8_kvcache` params so that people can immediately get to know what is added here <!-- 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.export.trt_llm.converter.model_converter
nemo/export/trt_llm/converter/model_converter.py:37:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/converter/model_converter.py:50:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/converter/model_converter.py:110:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/converter/model_converter.py:16:0: W0611: Unused import csv (unused-import)
************* Module nemo.export.trt_llm.nemo_ckpt_loader.nemo_file
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:51:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:162:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:192:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:203:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:207:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:232:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:243:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:264:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:359:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:477:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:564:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:568:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:579:0: C0115: Missing class docstring (missing-class-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:591:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:631:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:668:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:681:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/export/trt_llm/nemo_ckpt_loader/nemo_file.py:25:0: W0611: Unused import tensorstore (unused-import)

-----------------------------------
Your code has been rated at 9.81/10
```

---

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! [🤖]: Hi @Laplasjan107 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12548597780) 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
# What does this PR do ?

Support FP8 TE TRT-LLM export with mcore path

**Collection**: llm/nlp

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
* You can potentially add a usage example below

```python
from nemo.export.tensorrt_llm import TensorRTLLM

trt_llm_exporter = TensorRTLLM(model_dir="/opt/checkpoints/tmp_triton_model_repository/")
trt_llm_exporter.export(nemo_checkpoint_path="/path/to/quantized/model", model_type="llama", fp8_quantized=True, fp8_kvcache=True)

# Autodetects when quantisation flags are not set
output = trt_llm_exporter.forward(["What is the best city in the world?"], max_output_token=17, top_k=1, top_p=0.0, temperature=1.0)
print("output: ", output)
```

# GitHub Actions CI

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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**:
- [ ] 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)
