Update jemalloc-sys to 0.3.2
Update jemalloc-sys to 0.3.2 to avoid issue where jemalloc occasionally keeps
spinning in `je_spin_adaptive`.
- [X] `./mach build --release` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#24791
Enable webxr by default
This changes two things:
* enable WebXR by default, since it's not exactly an experimental technology in Servo anymore
* enable the glwindow webxr backend by default so it's easier to test WebXR on desktop nightlies
Since the glwindow pref is only checked in the glutin desktop port, enabling it for other ports does not hurt us at all and it removes a papercut for testing WebXR content on desktop.
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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] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [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.
