Add @mediabunny/ac3 extension package

package-lock.json

@@ -1413,6 +1413,10 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mediabunny/ac3": {
+      "resolved": "packages/ac3",
+      "link": true
+    },
     "node_modules/@mediabunny/mp3-encoder": {
       "resolved": "packages/mp3-encoder",
       "link": true
@@ -12063,6 +12067,21 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "packages/ac3": {
+      "name": "@mediabunny/ac3",
+      "version": "1.33.0",
+      "license": "MPL-2.0",
+      "devDependencies": {
+        "@types/emscripten": "^1.40.1"
+      },
+      "funding": {
+        "type": "individual",
+        "url": "https://github.com/sponsors/Vanilagy"
+      },
+      "peerDependencies": {
+        "mediabunny": "^1.0.0"
+      }
+    },
     "packages/mp3-encoder": {
       "name": "@mediabunny/mp3-encoder",
       "version": "1.33.0",