feat: passed request_id as a header to microservices

[TunixR]

This pull request includes changes to the src/main.rs file to enhance request handling by adding a new request_id parameter. The changes primarily focus on modifying the build_downstream_request function to include this new parameter and properly forward it as a header.

Enhancements to request handling:

• src/main.rs: Modified async fn handle_request to pass the request_id parameter to build_downstream_request.
• src/main.rs: Updated the function signature of async fn build_downstream_request to include the request_id parameter.
• src/main.rs: Added logic to insert the request_id as an x-request-id header in the build_downstream_request function.

[Copilot]

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[alvarobernal2412]