Refactor training loop from script to class

[sweep-nightly]

Description

This PR refactors the training loop from a script to a class in order to improve organization and reusability. The existing code in src/main.py for loading and preprocessing the MNIST data has been moved into a new class named MNISTTrainer. The training loop is now implemented in the train method of the MNISTTrainer class. The src/api.py file has been updated to use the MNISTTrainer class for loading the data and training the model.

Summary of Changes

• Created a new class named MNISTTrainer in src/main.py to encapsulate the training logic.
• Moved the code for loading and preprocessing the MNIST data into the load_data method of the MNISTTrainer class.
• Implemented the training loop in the train method of the MNISTTrainer class.
• Updated the import statement in src/api.py to import the MNISTTrainer class.
• Updated the code in src/api.py to use the MNISTTrainer class for loading the data and training the model.
• Updated docstrings and comments to reflect the changes.

Please review and merge this PR.

Fixes #6.

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Rollback Files For Sweep

• Rollback changes to src/main.py
• Rollback changes to src/api.py

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