Async wasm compilation event loop integration
The PR contains changes related to binding the runnable dispatching in script_runtime and is part of the Asynchronous WebAssembly Compilation fix. This is the first step in the subsequent steps mentioned in the [wiki](https://github.com/servo/servo/wiki/Asynchronous-WebAssembly-compilation-project).
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- [X] These changes are part of #21476 fix
Media Session API
- [X] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#24172
- [x] There are tests for these changes
This PR introduces all the pieces required to prove an end to end media session flow with Android as a test platform.
Support translation in webxr on desktop
This makes it possible to roam around webxr scenes using the WASD keys, and the arrow keys continue to change the user's orientation.
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#24773
- [x] These changes do not require tests because no tests for interactive webxr content
Avoid recompiling script every time surfman changes
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Uses a version of webxr where webxr-api doesn't depend on surfman, so we can make changes to it without rebuilding script.
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because it's just build issues
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