Add FrameworkStatsLog

Add a genrule for FrameworkStatsLog and it to frameworks.jar

As part of statsd becoming a Mainline module in R, autogenerated
StatsLog.write() calls are going away and replaced by *StatsLog.java
that is autogenerated for each module.
This CL adds autogenerated FrameworkStatsLog.

Follow up CLs will replace usages of StatsLog.write calls with
FrameworkStatsLog.write.

Bug: 145952197
Test: m
Merged-In: I6ba6a67e019a3b5cffd936dad7ce9db6c8c51632
Change-Id: I6ba6a67e019a3b5cffd936dad7ce9db6c8c51632
(cherry-pick from internal branch with minor conflicts)