Add config for FULL_SYSTEM_OPTIMIZE_JAVA

FULL_SYSTEM_OPTIMIZE_JAVA allows device to enable full system java
optimization. FULL_SYSTEM_OPTIMIZE_JAVA will override
SYSTEM_OPTIMIZE_JAVA.

Modified proguard flags and kept classes1 that are necessary when
optimization is enabled.

Bug: 300514883
Test: local m, device boot and briefly tested
Change-Id: If4555dcc7bc2d2c1f8fb9bee044de666d6db04a7