Evo2 prediction and inference scripts, and example notebooks. (#1419)

### Description

This PR adds back prediction and inference scripts, as well as the
fine-tuning and brca zero shot fine-tuning notebooks. This also adds in
support for batched vortex generation.

#### Usage

See `examples/*.ipynb` in the `evo2_megatron` recipe for usage.

### Type of changes

<!-- Mark the relevant option with an [x] -->

- [x] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Refactor
- [ ] Documentation update
- [ ] Other (please describe):

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### Pre-submit Checklist

<!--- Ensure all items are completed before submitting -->

- [ ] I have tested these changes locally
- [ ] I have updated the documentation accordingly
- [ ] I have added/updated tests as needed
- [ ] All existing tests pass successfully


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Full inference engine and CLI for text generation, prediction
workflow, and a simple token-generation helper.
  * New training flag to disable FP8 weight gradients.

* **Bug Fixes**
  * Corrected multi-batch decoding behavior.
* Ensured final normalization is always defined and
preprocessing/postprocessing flags honor explicit disables.

* **Improvements**
  * Tokenizer decoding switched to a Fuse decoder.
* Enhanced GPU cleanup and robust test utilities; expanded, runnable
test suites.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: John St. John <jstjohn@nvidia.com>

Author: jstjohn

bionemo-recipes/recipes/evo2_megatron/examples/.gitignore

@@ -8,6 +8,7 @@
 
 # directories created during these notebook runs.
 nemo2_evo2_1b_8k/
+evo2_1b_bf16_mbridge/
 preprocessed_data/
 pretraining_demo/
 brca1_fasta_files/