Add BERT Embedding Model
State: closed | Pull request: yes

# What does this PR do ?

Add a one line overview of what this PR aims to accomplish.

**Collection**: [Note which collection this PR will affect]

# 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-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.llm.bert.data.core
nemo/collections/llm/bert/data/core.py:25:0: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/bert/data/core.py:32:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.collections.llm.bert.data.specter
nemo/collections/llm/bert/data/specter.py:34:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/llm/bert/data/specter.py:39:0: C0301: Line too long (129/119) (line-too-long)
nemo/collections/llm/bert/data/specter.py:40:0: C0301: Line too long (120/119) (line-too-long)
nemo/collections/llm/bert/data/specter.py:101:0: C0301: Line too long (125/119) (line-too-long)
nemo/collections/llm/bert/data/specter.py:78:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/bert/data/specter.py:134:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/collections/llm/bert/data/specter.py:16:0: W0611: Unused lru_cache imported from functools (unused-import)
************* Module nemo.collections.llm.bert.model.embedding
nemo/collections/llm/bert/model/embedding.py:65:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/bert/model/embedding.py:158:0: C0115: Missing class docstring (missing-class-docstring)
nemo/collections/llm/bert/model/embedding.py:7:0: W0611: Unused InferenceParams imported from megatron.core (unused-import)
nemo/collections/llm/bert/model/embedding.py:7:0: W0611: Unused tensor_parallel imported from megatron.core (unused-import)
nemo/collections/llm/bert/model/embedding.py:12:0: W0611: Unused HuggingFaceBertModel imported from nemo.collections.llm.bert.model (unused-import)

-----------------------------------
Your code has been rated at 9.69/10
```

---

Thank you for improving NeMo's documentation!

<!-- 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.llm.api
nemo/collections/llm/api.py:605:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.lightning.io.api
nemo/lightning/io/api.py:39:0: C0301: Line too long (127/119) (line-too-long)
nemo/lightning/io/api.py:171:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.97/10
```

---

Thank you for improving NeMo's documentation!