[Pod] Add SystemUI pod benchmarks.

Add benchmarks for recompiling SysUI if we:
 1) Change a pod interface
 2) Change a pod internal implementation

Bug: 307607958
Bug: 430081340
Flag: EXEMPT benchmark change
Test: `build/make/tools/perf/benchmarks --benchmark systemui_pod_impl
systemui_pod_api` -> runs benchmarks

Change-Id: I30cd77c67025972edf45dd3dc524fcbdc564dece