[4/N] WindowDecor refactor: add TraceUtils lib into WMShell

Adds TraceUtils lib into WMShell for easier tracing. This will allow use
of traceSection instead of using startTrace/endTrace, allowing for
cleaner code since we don't have to worry about ending trace every time
we return.

Bug: 414636001
Flag: com.android.window.flags.enable_window_decoration_refactor
Test: m
Change-Id: I4df429843baf37e0c9a11431419710e4167b0cae