fix: implement .metrics

The service assumes it exists

lib/main.js

@@ -1,5 +1,6 @@
 import { ReadFile } from '@eik/common';
 import Sink from '@eik/sink';
+import MetricsClient from '@metrics/client';
 import { Readable, Writable } from 'node:stream';
 
 /** @type {Map<string, string>} */
@@ -8,6 +9,12 @@ let content = new Map();
 let mimetypes = new Map();
 
 export default class SinkMemory extends Sink {
+    #metrics = new MetricsClient();
+
+    get metrics() {
+        return this.#metrics;
+    }
+
     /**
      * @param {string} filePath
      * @param {string} contentType

package.json

@@ -33,7 +33,8 @@
   "homepage": "https://github.com/eik-lib/sink-memory#readme",
   "dependencies": {
     "@eik/common": "3.0.1",
-    "@eik/sink": "1.2.4"
+    "@eik/sink": "1.2.5",
+    "@metrics/client": "2.5.2"
   },
   "devDependencies": {
     "@semantic-release/changelog": "6.0.3",