Feat/rc6 add RC6 Encrypt/Decrypt operations (#2163)

Author: thomasxm

src/core/config/Categories.json

@@ -109,6 +109,8 @@
             "Rabbit",
             "SM4 Encrypt",
             "SM4 Decrypt",
+            "RC6 Encrypt",
+            "RC6 Decrypt",
             "GOST Encrypt",
             "GOST Decrypt",
             "GOST Sign",