Add initial skeleton for HealthClient API in mssf_core

[OscarTHZhang]

Add initial skeleton for HealthClient API in mssf_core with health report types and report health. Other health client functions are left as todos.

[cgettys-microsoft]

Seems reasonable to me, for what that's worth :).

[youyuanwu]

Who is responsible to destroy/free the raw ptr? This is a mem leak.

[OscarTHZhang]

See the latest change - I created a utility wrapper on top of the raw COM types, which calls Box::from_raw() in drop. There should be no mem leak according to valgrind.

[OscarTHZhang]

Here is the valgrind output on the conversion tests on latest commit. No memory leaks detected:

test types::client::health::test::test_cluster_health_report_wrapper_conversion ... ok
test types::client::health::test::test_application_health_report_conversion ... ok
test types::client::health::test::test_stateful_service_replica_health_report_conversion ... ok
test types::client::health::test::test_stateful_service_replica_health_report_wrapper_conversion ... ok
test types::client::health::test::test_cluster_health_report_conversion ... ok
test types::client::health::test::test_node_health_report_wrapper_conversion ... ok
test types::client::health::test::test_partition_health_report_conversion ... ok
test types::client::health::test::test_partition_health_report_wrapper_conversion ... ok
test types::client::health::test::test_service_health_report_wrapper_conversion ... ok
test types::client::health::test::test_invalid_health_report_conversion ... ok
test types::client::health::test::test_application_health_report_wrapper_conversion ... ok
test types::client::health::test::test_deployed_service_package_health_report_conversion ... ok
test types::client::health::test::test_deployed_service_package_health_report_wrapper_conversion ... ok
test types::client::health::test::test_deployed_application_health_report_wrapper_conversion ... ok
test types::client::health::test::test_stateless_service_instance_health_report_conversion ... ok
test types::client::health::test::test_service_health_report_conversion ... ok
test types::client::health::test::test_stateless_service_instance_health_report_wrapper_conversion ... ok
test types::client::health::test::test_deployed_application_health_report_conversion ... ok

test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 20 filtered out; finished in 0.33s

==3055234==
==3055234== HEAP SUMMARY:
==3055234==     in use at exit: 0 bytes in 0 blocks
==3055234==   total heap usage: 1,332 allocs, 1,332 frees, 147,258 bytes allocated
==3055234==
==3055234== All heap blocks were freed -- no leaks are possible

[youyuanwu]

Seems like u got access violation in the windows tests. The box into_raw should be unsafe code and needs special care. Also I don't know what Rust optimizer would do.

[OscarTHZhang]

The type conversion using From is deemed unsafe - release test failed with segfault. The latest change uses stack instead