Add ComposeTracingStartable

This CL adds a new startable and SystemUI command to enable composition
tracing.

Usage:
$ adb shell cmd statusbar composition_tracing enable
$ ${ANDROID_BUILD_TOP}/external/perfetto/tools/record_android_trace -c ${ANDROID_BUILD_TOP}/prebuilts/tools/linux-x86_64/perfetto/configs/trace_config_detailed.textproto

Bug: 233351637
Test: Manual, recorded a trace and saw that compositions were traced
Flag: EXEMPT simple startable and tracing is disabled by default
Change-Id: I7488bd83b3427fb242a96f3110eb8c4845ed4981