Adding AIDL Service fuzzer for identity service

Test: m credstore_service_fuzzer && adb sync data && adb shell /data/fuzz/x86_64/credstore_service_fuzzer/credstore_service_fuzzer
Test: atest android.security.identity.cts
Bug: 232439428
Change-Id: I57494ad6a17e1a4a9dcb80d778edfd77a892790a
2 files changed