Add GitHub Action to Auto-Build and Commit Dist Files on Source Changes

[AnuKritiW]

This PR adds a GitHub Actions workflow that automatically builds and commits the distribution (dist) files whenever relevant source files are changed.

Motivation

Currently, updates to src/ require a manual build step to regenerate wgsl_reflect.node.js, wgsl_reflect.module.js, and their corresponding source maps. This can lead to outdated build artifacts being published to npm or used in dependent projects.

Automating this ensures:

• The dist files are always in sync with the latest source changes.
• Reduced manual overhead and human error.
• Immediate availability of the latest fixes and features when installing from GitHub.

Note: The workflow should not make a redundant commit if the build files are already up to date.

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I’m not sure if this approach aligns with the project’s workflow, so feel free to disregard if it doesn’t fit your process.

[brendan-duncan]

I'll think about this one some more. So far it hasn't been an issue, but it wouldn't hurt, either. I'll get through my work day and come back to this.