composer: few changes for refresh rate switching

 - getDisplayConfigs is required to remain backward compatible with
   composer@2.3 and older versions. To keep it that way a new config
   attribute was added to group similar configs.
 - getSupportedDisplayVsyncPeriods was removed as the vsync period
   can be obtained by getDisplayAttribute for each individual config.
 - renamed setActiveConfigAndVsyncPeriod -> setActiveConfigWithConstraints
   to better describe what this function does.
 - added VsyncPeriodChangeTimeline and onVsyncPeriodTimingChanged

With these changes composer is expected to return all possible
configurations when getDisplayConfigs (similar to older composer versions).
The client knows whether a seamless vsync period is possible or not by
the config groups.

Test: rev up composer to 2.4 and test refresh rate switching
Bug: 141329414
Change-Id: I1b4525f7e00b62cdaf260274abe4a6a5962ed1ab