Move VsyncConfiguration from SF to Scheduler

This is part of the long term goal, tracked in b/241285191, of moving
scheduling logic/state from SF to Scheduler. It also paves the way for
a cleaner version of Ib927935de6ba2b7b8d5037b42eb635ae92019634.

Bring RefreshRateStats along to Scheduler, since it is updated along
with work that belongs in Scheduler.

Mostly this is intended to not change behavior, but there are some
exceptions:
- the ordering of dumpsys SurfaceFlinger has changed, as some components
  are now internal to Scheduler, so they are dumped along with it.
- two extra calls to update the RefreshRateStats along with
  updatePhaseConfiguration. The missing calls appear to be an oversight,
  and it's more natural to include the update in its new location.

Move construction of VsyncModulator into Scheduler, since it is
constructed from the VsyncConfiguration, now constructed in Scheduler.

Add TestableScheduler.cpp, to prevent adding a circular dependency, now
that the class's constructor references TestableSurfaceFlinger.

Add Dumper::out for simplicity in updating dump calls.

Bug: 241285191
Bug: 255601557
Bug: 256196556
Bug: 259132483
Test: libscheduler_test
Test: libsurfaceflinger_unittest
Change-Id: I01c93cfc3d2342cfbaaf8fe47dc2cd57d0e1fc43