runtime: Refactor, add basic profiling
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runtime: Fix some misleading log messages and comments
These refer to the host, but in a Flatpak subsandbox environment the graphics stack provider is not actually the host.
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runtime: Factor out various parts of pv_runtime_use_provider_graphics_stack
As well as making this giant function a bit smaller, this will make it easier to insert profiling markers to see where the time goes.
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steam-runtime-tools: Add a simple profiling interface
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runtime: Measure various parts of container setup