Add fast trace collection & use it for instrumenting guest memory operations#103

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Commits on Dec 10, 2024

[hyperlight_host] Restrict OutBHandler{Caller,Wrapper} to pub(crate)
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[hyperlight_host] Plumb a trace file descriptor around
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[hyperlight_host/exe] Allow load() to consume the exe_info
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[hyperlight_host/trace] Add HV interface for reading trace registers
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[hyperlight_host/trace] Support collecting guest stacktraces
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Add trace support for recording memory allocations and frees
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Add basic utility for dumping logs and memory statistics from traces
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