Adding soong module and tool to check if there is fuzzer present
for every service in private/service_contexts. Whenever a service is
added, its is recommended to update
$ANDROID_BUILD_TOP/system/sepolicy/soong/build/service_fuzzer_bindings.go
with service name and its corresponding fuzzer.
Test: m
Bug: 242104782
Change-Id: Id9bc45f50bebf464de7c91c7469d4bb6ff153ebd