Add channel cloning

Changes:
    - Added function cloneChannel
    - Modified createChannel to support cloneChannel
   - Added clone(reason) method on channel structure
    - Added channel cloning tests

tests/channels/clone_channel.ts

@@ -0,0 +1,48 @@
+import { defaultTestOptions, tempData } from "../ws/start_bot.ts";
+import { assertEquals, assertExists } from "../deps.ts";
+import { cache } from "../../src/cache.ts";
+import { cloneChannel } from "../../src/helpers/channels/clone_channel.ts";
+import { delayUntil } from "../util/delay_until.ts";
+
+Deno.test({
+  name: "[channel] clone a channel",
+  async fn() {
+    const cloned = await cloneChannel(tempData.channelId, "testing");
+
+    //Get channel that was cloned
+    const originalChannel = cache.channels.get(tempData.channelId);
+
+    //Assertation
+    assertExists(cloned);
+    assertEquals(cloned.type, originalChannel.type);
+
+    // Delay the execution to allow CHANNEL_CREATE event to be processed
+    await delayUntil(10000, () => cache.channels.has(cloned.id));
+
+    if (!cache.channels.has(cloned.id)) {
+      throw new Error(`The channel seemed to be cloned but was not cached.`);
+    }
+
+    if (originalChannel.topic && cloned.topic !== originalChannel.topic) {
+      throw new Error(
+        "The clone was supposed to have a topic but it does not appear to be the same topic."
+      );
+    }
+
+    if (originalChannel.bitrate && cloned.bitrate !== originalChannel.bitrate) {
+      throw new Error(
+        "The clone was supposed to have a bitrate but it does not appear to be the same bitrate."
+      );
+    }
+
+    if (
+      originalChannel.permissionOverwrites &&
+      cloned.permissionOverwrites?.length !==
+        originalChannel.permissionOverwrites.length
+    ) {
+      throw new Error(
+        "The clone was supposed to have a permissionOverwrites but it does not appear to be the same permissionOverwrites."
+      );
+    }
+  },
+});