Add function support for timeWindow

[mindrunner]

This update allows timeWindow to be a function that can dynamically determine the time window based on the request and key. The code refactor has been applied across both the Redis and Local stores. Tests for this new functionality have been added to ensure correctness. The TypeScript definition was also updated to reflect this change.

https://github.com/fastify/fastify-rate-limit/issues/283

Checklist

• [x] run npm run test and npm run benchmark
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message and code follows the Developer's Certification of Origin and the Code of conduct

[mindrunner]

Could you update the tests for the types?

done

[gurgunday]

@mindrunner can you try targeting next?

[mindrunner]

@mindrunner can you try targeting next?

done

[gurgunday]

Thanks again for the PR