Secretkeeper/VTS: Per-connection replay protection

Add test coverage for replay protection in Secretkeeper. Test that:
1. Sk implementation encrypts/decrypts messages using correct
sequence_numbers.
2. Out of order messages are not accepted.
3. The sequence numbers are per-connection ie, new SeqNum is used for a
   fresh connection.

Also, refactor code. SeqNumbers are maintained by
libsecretkeeper_client. Have sk_client use a handle to SkSession for
SecretManagement requests. Replay protection tests however require more
fine grained control of SeqNums. For these we have introduced
`secret_management_request_custom_aad()` method.

Bug: 316126411
Test: atest VtsSecretkeeperTargetTest
Change-Id: I385856c04e185d2b300d59a1b54cb8f09cbf836f
diff --git a/security/secretkeeper/aidl/vts/Android.bp b/security/secretkeeper/aidl/vts/Android.bp
index 7fc7a70..7de9d6a 100644
--- a/security/secretkeeper/aidl/vts/Android.bp
+++ b/security/secretkeeper/aidl/vts/Android.bp
@@ -27,6 +27,7 @@
     ],
     test_config: "AndroidTest.xml",
     rustlibs: [
+        "libsecretkeeper_client",
         "libsecretkeeper_comm_nostd",
         "libsecretkeeper_core_nostd",
         "android.hardware.security.secretkeeper-V1-rust",