feat: introduce pino as a logger for the CLI

In its current configuration, the logger outputs lines of structured JSON to
a file called `checkly.debug.log` in the current directory. This will change
later.

By default, logs are silenced. Only when you set CHECKLY_LOG_LEVEL, does the
log file actually receive any content.

packages/cli/package.json

@@ -91,6 +91,7 @@
     "mqtt": "5.10.1",
     "open": "8.4.0",
     "p-queue": "6.6.2",
+    "pino": "9.5.0",
     "prompts": "2.4.2",
     "proxy-from-env": "1.1.0",
     "recast": "0.23.4",

packages/cli/src/services/logger.ts

@@ -0,0 +1,24 @@
+import pino from 'pino'
+
+export const rootLogger = pino(
+  {
+    level: process.env.CHECKLY_LOG_LEVEL || 'silent',
+    formatters: {
+      bindings: (bindings) => {
+        return { pid: bindings.pid }
+      },
+      level: (label) => {
+        return { level: label.toUpperCase() }
+      },
+    },
+    timestamp: pino.stdTimeFunctions.isoTime,
+    redact: {
+      paths: [
+        'password',
+      ],
+    },
+  },
+  pino.destination('checkly.debug.log'),
+)
+
+export type Logger = pino.Logger