feat: add TS devOnlyServer plugin (#42)

* feat: add TS devOnlyServer plugin

This plugin will send an error message when the command is ran outside of the specified guild id(s).
If there is no `perFail` message provided, the code will provide an error.

* feat: edit devServerOnly plugin

EDIT: Checks if the fail message exists.

* refactor: changed name of plugin

Changed name of plugin devOnlyServer.ts to serverOnly.ts

* refactor: changed name of plugin on sample command

Forgot to change name of plugin on the sample command during previous refactor.

* refactor: update default failMessage parameter.

Correct default fail message.

TypeScript/serverOnly.ts

@@ -0,0 +1,43 @@
+// @ts-nocheck
+/**
+ * Checks if a command is available in a specific server.
+ *
+ * @author @D3ord3NidAm [<@1017182455926624316>]
+ * @version 1.0.0
+ * @example
+ * ```ts
+ * import { commandModule, CommandType } from "@sern/handler";
+ * import { serverOnly } from "../plugins/serverOnly";
+ * export default commandModule({
+ *   type: CommandType.Both,
+ *   plugins: [serverOnly(["guildId"], failMessage)], // fail message is the message you will see when the command is ran in the wrong server.
+ *   description: "command description",
+ *   execute: async (ctx, args) => {
+ *     // your code here
+ *   },
+ * });
+ * ```
+ */
+
+import { CommandType, EventPlugin, PluginType } from "@sern/handler";
+
+export function serverOnly(
+  guildId: string[],
+  failMessage = "I am unable to comply with your command."
+): EventPlugin<CommandType.Both> {
+  return {
+    type: PluginType.Event,
+    description: "Checks if a command is available in a specific server.",
+    async execute([ctx, args], controller) {
+      if (!guildId.includes(ctx.guildId)) {
+        await ctx.reply(failMessage).then(async (m) => {
+          setTimeout(async () => {
+            await m.delete();
+          }, 3000);
+        });
+        return controller.stop();
+      }
+      return controller.next();
+    },
+  };
+}