Updated Optuna example

[SiddhantSadangi]

Description

Updated Optuna example code

Related to: Update Optuna example

Any expected test failures?

• Notebook tests will fail on Windows and Mac as the kernel needs to be restarted to import lightgbm
• Script tests will fail on Mac due to issue with LightGBM installation on MacOS

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Add a [X] to relevant checklist items

❔ This change

• [X] adds a new feature
• [ ] fixes breaking code
• [X] is cosmetic (refactoring/reformatting)

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✔️ Pre-merge checklist

• [X] Refactored code (sourcery)
• [X] Tested code locally
• [X] Precommit installed and run before pushing changes
• [ ] Added code to GitHub tests (notebooks, scripts)
• [X] Updated GitHub README
• [ ] Updated the projects overview page on Notion

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🧪 Test Configuration

• OS: Windows11
• Python version: 3.10.11
• Neptune version: 1.10.4
• Affected libraries with version: neptune-optuna==1.2.0