feat: expose native canvas present modes

[huytdps13400]

Summary

• add a non-standard presentMode field to GPUCanvasConfiguration
• map fifo, fifo-relaxed, immediate, and mailbox to Dawn's native surface modes
• keep FIFO as the default and stop SurfaceRegistry from overwriting the caller's selection
• document platform-dependent support and add TypeScript/native regression coverage

This addresses the present-mode portion of #444. It intentionally does not add DisplayLink/Choreographer ownership or a refresh-rate scheduler, matching the maintainer's scope guidance in the issue.

Unsupported modes remain subject to Dawn's existing surface configuration validation.

Verification

• yarn workspace react-native-webgpu tsc
• yarn workspace react-native-webgpu test:node CanvasConfiguration.spec.ts (3 tests passed)
• yarn workspace react-native-webgpu build
• yarn workspace docs tsc
• yarn workspace docs build:docs
• clang++ -std=c++20 -fsyntax-only ... GPUCanvasContext.cpp
• cpplint on all changed C++ files

The full local Node-WebGPU suite also ran; all relevant tests passed, with one unrelated existing Node backend failure in GPU.spec.ts where limits.maxBindGroups serializes as undefined.