增加添加和绑定sn，增加阿里云推送

src/main/java/com/onekeycall/videotablet/tencent/trtc/Base64URL.java

@@ -0,0 +1,24 @@
+package com.onekeycall.videotablet.tencent.trtc;
+
+import java.util.Base64;
+
+public class Base64URL {
+    public static byte[] base64EncodeUrl(byte[] input) {
+        byte[] base64 = Base64.getEncoder().encode(input);
+        for (int i = 0; i < base64.length; ++i)
+            switch (base64[i]) {
+                case '+':
+                    base64[i] = '*';
+                    break;
+                case '/':
+                    base64[i] = '-';
+                    break;
+                case '=':
+                    base64[i] = '_';
+                    break;
+                default:
+                    break;
+            }
+        return base64;
+    }
+}