[WebGPU] Implement async tensor api and event api (#22099)

[WebGPU] Implement async tensor api and event api  (#22099)

* Only run webgpu CI on my fork

* Implement set_tensor_async

* Implement synchronize api

* Implement event creation and deletion API

* Cleanup

* Cleanup

* Comment out jobs for local CI run

* Add webgpu only workflow

* Delete .github/workflows/build-webgpu.yml

* Cleanup

* Cleanup

* Update API with function handlers

* Run clang-format

* Replace one-shot buffer with a direct queue.WriteBuffer using the buffer context