Update logger formatting, add dev script

deno.json

@@ -1,6 +1,7 @@
 {
   "importMap": "./import_map.json",
   "tasks": {
-    "start": "deno run -A --unstable main.ts"
+    "start": "deno run -A --unstable main.ts",
+    "dev": "deno run -A --unstable --watch main.ts"
   }
 }

logger.ts

@@ -3,11 +3,22 @@ import { isDenoDeploy } from "./utils.ts";
 
 log.setup({
   handlers: {
-    console: new log.handlers.ConsoleHandler("DEBUG"),
+    console: new log.handlers.ConsoleHandler("DEBUG", {
+      formatter: (logRecord) => {
+        let msg = `${logRecord.levelName} ${logRecord.msg}`;
+
+        logRecord.args.forEach((arg, index) => {
+          msg += `, arg${index}: ${arg}`;
+        });
+
+        return msg;
+      },
+    }),
   },
   loggers: {
     default: {
       level: isDenoDeploy ? "INFO" : "DEBUG",
+      handlers: ["console"],
     },
   },
 });