fix: issue with module workers

[Bayheck]

Purpose

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Approach

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References

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Pre-Merge TODO

• Write tests for your proposed changes
• Make sure that existing tests do not fail

[github-actions]

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[Copilot]

Pull request overview

This PR attempts to fix an issue with module workers by detecting whether a worker is a module worker and using import() instead of importScripts() to load the hammerhead library.

• Adds an isModule() detection function that attempts to call importScripts() to determine if the worker context is a module worker
• Conditionally uses import() for module workers and importScripts() for classic workers
• Updates the worker initialization code in the script header template

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