Add client information to release and renewal messages

[ Merge of go/wvgerrit/14240 ]

Client information is reported in release and renewal messages based on
flag in the license. License proto has been updated to match server updates.

There are two caveats
* Client IDs will be reported unencrypted when usage reports are requested.
* Release requests that enable privacy mode (encrypted client IDs) but do not
  specify a service certificate are not supported.

b/19247020

Change-Id: I95e709922122370f310936fbad3d312262128e49

libwvdrmengine/cdm/core/src/device_files.proto

@@ -13,6 +13,11 @@ package video_widevine_client.sdk;
 // need this if we are using libprotobuf-cpp-2.3.0-lite
 option optimize_for = LITE_RUNTIME;
 
+message NameValue {
+  optional string name = 1;
+  optional string value = 2;
+}
+
 message DeviceCertificate {
   optional bytes certificate = 1;
   optional bytes wrapped_private_key = 2;
@@ -33,6 +38,7 @@ message License {
   optional bytes release_server_url = 7;
   optional int64 playback_start_time = 8 [default = 0];
   optional int64 last_playback_time = 9 [default = 0];
+  repeated NameValue app_parameters = 10;
 }
 
 message UsageInfo {