Add a WebGPU demo (#31)

Restructures the repository to accommodate non-AudioWorkstation examples and adds an example of interacting with WebGPU via JavaScriptKit and WebAPIKit.

Co-authored-by: Max Desiatov <m_desiatov@apple.com>
Co-authored-by: Dario Rexin <drexin@apple.com>
Co-authored-by: Allan Shortlidge <shortlidge@apple.com>
Co-authored-by: Ben Barham <ben_barham@apple.com>

Author: 4 people

.github/workflows/pull_request.yml

@@ -9,7 +9,7 @@ jobs:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      linux_build_command: "cd Guest && ./build.sh"
+      linux_build_command: "cd AudioWorkstation/Guest && ./build.sh"
       linux_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "5.10"}]'
       enable_windows_checks: false
   soundness: