perf c2c: add function view model skeleton

Add the initial common model for the c2c function view: model state and
small helpers shared by the hierarchy construction and formatting added
in later patches.

Build the model from util/ so it remains independent of the TUI and
command-private symbols.

Signed-off-by: Jiebin Sun <jiebin.sun@intel.com>
Reviewed-by: Tianyou Li <tianyou.li@intel.com>
Reviewed-by: Wangyang Guo <wangyang.guo@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Dapeng Mi <dapeng1.mi@linux.intel.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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