pom2bp: add apex_available/min_sdk_version

apex_available/min_sdk_version are required to be available for mainline
modules(APK/APEX).

- java_import/java_library_static
- android_library/android_library_import

Bug: 156996905
Test: prebuilts/sdk/update_prebuilts.sh
Change-Id: I201ebabaa533c5ee19e394ab30ca2fa0e3d7ce0e