Adding host script to run test fuzzer.

Adding a test fuzzer which calls into TestService which aborts
in implemented methods. This allows us to test fuzzService
functionality. Adding sh_host_test which will run this test.

Test: atest -c fuzz_service_test
Bug: 282239388
Change-Id: I0bfff9b4b7ff124415206a7f40db0e88bee1962d