Instead of embedding "raw" values from PRODUCT_*_CLASSPATH variables
into /etc/classpath, encode them into classpaths.proto binary format.
Existing platform_bootclasspath{} module is used to generate the whole
monolithic config to begin with. Later, the config will be split
among individual bootclasspath_fragment and
systemserverclasspath_fragment modules.
Bug: 180105615
Test: m && launch_cvd
Change-Id: Ia66f521f8976ff78a62ecf91131d26db21064de7
A skeleton of a classpath fragment's interface and base to be used by
any modules that provide entries for *CLASSPATH variables at runtime.
In follow up changes, this would be extended to generate
packages/modules/SdkExtensions/proto/classpaths.proto configs for such
modules to be bundled into system and individual apex binaries.
Bug: 180105615
Test: m
Change-Id: I2df550862e97222c5650c4d0480c90231fd78ef0
