(1) Move the CryptoMode enum definition to media_cas_packager_sdk partners can use it when calling libraries in the SDK.

(2) Add a new enum value for kDvbCsa.
(3) Allow caller to specify CTR, CBC, as well as CSA when using the ecm genertor from the SDK.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=219707788

example/BUILD

@@ -48,6 +48,6 @@ cc_binary(
     deps = [
         "@abseil_repo//absl/base:core_headers",
         "//media_cas_packager_sdk/public:wv_cas_ecm",
-        "//media_cas_packager_sdk/public:wv_cas_status",
+        "//media_cas_packager_sdk/public:wv_cas_types",
     ],
 )

example/wv_cas_ecm_example.cc

@@ -12,11 +12,10 @@
 #include <string>
 
 #include "media_cas_packager_sdk/public/wv_cas_ecm.h"
-#include "media_cas_packager_sdk/public/wv_cas_status.h"
+#include "media_cas_packager_sdk/public/wv_cas_types.h"
 
 const int kContentIvSize = 16;
 const bool kKeyRotationEnabled = true;
-const int kCryptoMode = 1;                                          // CTR
 const char kEvenKey[] = "even_content_key";                         // 16 bytes
 const char kEvenContentIv8Bytes[] = "evencont";                     // 8 bytes
 const char kEvenContentIv16Bytes[] = "evencontevencont";            // 16 bytes
@@ -29,7 +28,8 @@ const char kEntitlementKey[] = "entitlement_key.................";  // 32 bytes
 int main(int argc, char **argv) {
   widevine::cas::WvCasEcm wv_cas_ecm;
   widevine::cas::WvCasStatus status =
-      wv_cas_ecm.Initialize(kContentIvSize, kKeyRotationEnabled, kCryptoMode);
+      wv_cas_ecm.Initialize(kContentIvSize, kKeyRotationEnabled,
+                            widevine::cas::CryptoMode::kDvbCsa);
   if (status != widevine::cas::OK) {
     std::cerr << "Failed to initialize WV CAS ECM, error: "
               << widevine::cas::GetWvCasStatusMessage(status)