Propagate min and max sdk versions to classpaths.proto configs.

These attributed define a range for dessert releases where the jars
should be active, and included in corresponding CLASSPATH varibles by
derive_classpath.

Bug: 190818041
Test: presubmit
Change-Id: Ieb9aef29657ad0694d48a63019f93faca2678252
Merged-In: Ieb9aef29657ad0694d48a63019f93faca2678252
(cherry picked from commit cca4ab76)