Adding ApexInfo utility

This is to get name/version when the HAL is started from an APEX. This
is the initial work and just prints name/version on startup.

Bug: 268439003
Test: adb logcat | grep com.google.android.widevine
Change-Id: I756c042d544f973999738f7d17022d916b9712cd

libwvdrmengine/apex/proto/apex_manifest_minimal.proto

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto3";
+
+package apex.proto;
+
+// This is a partial view for system/apex/proto/apex_manifest.proto.
+message ApexManifest {
+
+  // APEX Name. Note that this can be different from what PackageManager sees.
+  // This is used to identify an APEX and to mount under /apex directory.
+  string name = 1;
+
+  // Version Number
+  int64 version = 2;
+
+}