Fixed issue with `examples/llm_inference/js` failing to load larger models by implementing buffered loading system allowing for the loading of larger models like Gemma 3n E2B & E4B

[RandomGamingDev]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes # (issue)

Checklist

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• [x] My code follows the code style of the project.
• [x] I have updated the documentation (if applicable).
• [x] I have added tests to cover my changes.

Type of Change

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation update (non-breaking change which updates documentation)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Additional Notes

Now capable of loading larger models (i.e. Google's E2B & E4B) without just completely crashing.

[RandomGamingDev]

@tyrmullen Apologies beforehand for the ping, but it seems like a lot of people struggled with the same issue, not being able to get past it, and you're the most active contributor on the repository (which I appreciate, I love Google's work on AI efficiency, and especially edge AI :D).