(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",
     ],
 )