Add PerfTrace API and add tracing to XmlHttpRequest

[ryantrem]

This PR depends on microsoft/arcana.cpp#51

• Add a public PerfTrace API that aims to provide a platform agnostic way of capturing perf intervals (just wraps arcana's trace_region). The API can be used purely on the native side, but it also includes helper functions for transferring ownership to JS, or taking ownership from JS. This makes it easy to get perf intervals for operations that start in native and end in JS, or vice versa.
• Also add a little more tracing to XmlHttpRequest.

[Copilot]

Pull Request Overview

This PR adds a platform-agnostic PerfTrace API that wraps arcana's trace_region functionality and integrates performance tracing into XMLHttpRequest operations. The implementation depends on updates to the upstream arcana.cpp library.

• Introduces a new PerfTrace API with configurable trace levels and handle management
• Adds performance tracing to XMLHttpRequest's Send and RaiseEvent methods
• Updates CMake configuration to link Foundation library with required dependencies

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
Core/Foundation/Include/Babylon/PerfTrace.h	Declares the public PerfTrace API with Level enum and Handle class
Core/Foundation/Source/PerfTrace.cpp	Implements PerfTrace API with arcana trace_region wrapping and Napi interop
Core/Foundation/CMakeLists.txt	Adds PerfTrace files and links Foundation with napi and arcana dependencies
Polyfills/XMLHttpRequest/Source/XMLHttpRequest.h	Adds m_url member to store URL for tracing purposes
Polyfills/XMLHttpRequest/Source/XMLHttpRequest.cpp	Integrates tracing into Send and RaiseEvent operations
CMakeLists.txt	Updates arcana.cpp dependency to personal fork with tracing support

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