contrib/plugins/uftrace: generate additional files for uftrace

Beyond traces per cpu, uftrace expect to find some specific files.
- info: contains information about machine/program run
  those values are not impacting uftrace behaviour (only reported by
  uftrace info), and we simply added empty strings.
- memory mapping: how every binary is mapped in memory. For system mode,
  we generate an empty mapping (uftrace_symbols.py, coming in future
  commit, will take care of that). For user mode, we copy current
  /proc/self/maps. We don't need to do any special filtering, as
  reported addresses will necessarily concern guest program, and not
  QEMU and its libraries.
- task: list of tasks. We present every vcpu/privilege level as a
  separate process, as it's the best view we can have when generating a
  (visual) chrome trace. Using threads is less convenient in terms of
  UI.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-ID: <20250902075042.223990-7-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250922093711.2768983-23-alex.bennee@linaro.org>

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