feat: add refresh handler

[peterphanouvong]

Explain your changes

• refresh tokens route handler Suppose there is a related issue with enough detail for a reviewer to understand your changes fully. In that case, you can omit an explanation and instead include either “Fixes #XX” or “Updates #XX” where “XX” is the issue number.

Checklist

• [x] I have read the “Pull requests” section in the contributing guidelines.
• [x] I agree to the terms within the code of conduct.

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Walkthrough

The changes involve modifications to the src/handlers/auth.js file, including adjustments to import statements and the routeMap object, which now includes a refresh function while excluding a setup function. Additionally, a new file, src/handlers/refresh.ts, has been created to define an asynchronous refresh function that manages token refreshing for a router client, handling success and error scenarios.

Changes

File	Change Summary
src/handlers/auth.js	Rearranged import statements; added refresh to routeMap and removed setup; optimized structure.
src/handlers/refresh.ts	Introduced a new asynchronous refresh function for handling token refreshing and error management.

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