Replace .Clone method with .WithContext for *http.Request in a middleware

[kucherenkovova]

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

🔧 Changes

Replace .Clone method with a more lightweight .WithContext for *http.Request in a middleware. WithContext returns a shallow copy while Clone does deep copy.

📚 References

• https://pkg.go.dev/net/http#Request.Clone
• https://pkg.go.dev/net/http#Request.WithContext

🔬 Testing

[kucherenkovova]

FYI @ewanharris

[ewanharris]

Thanks for the PR @kucherenkovova, could you maybe expand on why you're making the change?

Reviewing the history, it appears like this library used to use WithContext but moved away from it in #89 due to an issue raised in #62, so I'm hesitant to revert back to Clone

[kucherenkovova]

@ewanharris you're right, Clone works better in this case. Closing the PR.