feat(web): add registerVersion support for packages

[SelaseKay]

Description

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[russellwheatley]

Looking really good! Double check with @cynthiajoan about the naming of the library and a couple of minor adjustments from my perspective, and it LGTM.

[cynthiajoan]

Thanks for the change. The package name should be in the format of flutter-fire-xxxx

You can check the user-agent.gradle file for each package to take the reference
/packages/cloud_firestore/cloud_firestore/android/user-agent.gradle

[cynthiajoan]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces support for registerVersion for web packages, which helps in tracking package versions for analytics. The implementation involves a new script to auto-generate version files and updates to firebase_core_web to handle version registration. The changes are applied consistently across all relevant web packages. My review includes a couple of suggestions to improve the script's cross-platform compatibility and to fix the pre-commit hook to ensure the generated files are correctly staged.