add scoresaber feed command and websocket impl

src/main/java/cc/fascinated/bat/common/TextChannelUtils.java

@@ -0,0 +1,31 @@
+package cc.fascinated.bat.common;
+
+import cc.fascinated.bat.service.DiscordService;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+public class TextChannelUtils {
+    /**
+     * Checks if a channel is valid
+     *
+     * @param id the id of the channel
+     * @return if the channel is valid
+     */
+    public static boolean isValidChannel(String id) {
+        if (id == null) {
+            return false;
+        }
+        return DiscordService.JDA.getTextChannelById(id) != null;
+    }
+
+    /**
+     * Gets the mention of a channel
+     *
+     * @param id the id of the channel
+     * @return the mention of the channel
+     */
+    public static String getChannelMention(String id) {
+        return "<#" + id + ">";
+    }
+}