Create a module that extracts and installs compat_config.

Currently it extracts from the provided jar file compat/compat_config.xml
(generated by compat-changeid-annotation-processor) and installs on
/system/etc/sysconfig.
Future improvements:
 - Merge all the configs going for the system image into one, so that
   duplicate change ids across modules are failing the build instead of
   runtime.
 - Support uploading the config onto APEX for APEX modules.

Test: flashed device locally, config files found and read by
com.android.server.compat.CompatConfig.
Bug: 138222363

Change-Id: I64b11fdc466f746702e7e73f612794e024de2288