Update wasm/ folder structure

wasm/.gitignore

-/examples/*.mp4
-/node_modules
-/dist
 /cache
+/node_modules

wasm/package.json

 {
-  "name": "@ffmpeg/core",
-  "version": "0.10.0",
-  "description": "ffmpeg.wasm core",
-  "main": "dist/ffmpeg-core.js",
+  "name": "cores",
+  "version": "0.0.1",
+  "description": "",
+  "main": "index.js",
   "scripts": {
     "start": "serve .",
     "test": "node --experimental-wasm-threads --experimental-wasm-bulk-memory ./node_modules/.bin/jest"
   },
-  "files": [
-    "dist",
-    "package.json",
-    "package-lock.json"
-  ],
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/ffmpegwasm/FFmpeg.git"
-  },
-  "keywords": [
-    "ffmpeg",
-    "webassembly",
-    "video",
-    "audio",
-    "transcode"
-  ],
   "author": "jeromewus@gmail.com",
   "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/ffmpegwasm/FFmpeg/issues"
-  },
-  "homepage": "https://github.com/ffmpegwasm/FFmpeg#readme",
   "devDependencies": {
-    "jest": "^26.4.2",
-    "serve": "^11.3.2"
+    "jest": "^27.0.6",
+    "serve": "^12.0.0"
   }
 }

wasm/packages/core-st/.gitignore

+dist
+node_modules

wasm/packages/core-st/package-lock.json

+{
+  "name": "@ffmpeg/core-st",
+  "version": "0.10.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@ffmpeg/core-st",
+      "version": "0.10.0",
+      "license": "MIT"
+    }
+  }
+}

wasm/packages/core-st/package.json

+{
+  "name": "@ffmpeg/core-st",
+  "version": "0.10.0",
+  "description": "ffmpeg.wasm core (single thread)",
+  "main": "dist/ffmpeg-core.js",
+  "files": [
+    "dist",
+    "package.json",
+    "package-lock.json"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ffmpegwasm/FFmpeg.git"
+  },
+  "keywords": [
+    "ffmpeg",
+    "webassembly",
+    "video",
+    "audio",
+    "transcode"
+  ],
+  "author": "jeromewus@gmail.com",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/ffmpegwasm/FFmpeg/issues"
+  },
+  "homepage": "https://github.com/ffmpegwasm/FFmpeg#readme"
+}

wasm/packages/core/.gitignore

+dist
+node_modules

wasm/packages/core/package-lock.json

+{
+  "name": "@ffmpeg/core",
+  "version": "0.10.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "@ffmpeg/core",
+      "version": "0.10.0",
+      "license": "MIT"
+    }
+  }
+}

wasm/packages/core/package.json

+{
+  "name": "@ffmpeg/core",
+  "version": "0.10.0",
+  "description": "ffmpeg.wasm core",
+  "main": "dist/ffmpeg-core.js",
+  "files": [
+    "dist",
+    "package.json",
+    "package-lock.json"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/ffmpegwasm/FFmpeg.git"
+  },
+  "keywords": [
+    "ffmpeg",
+    "webassembly",
+    "video",
+    "audio",
+    "transcode"
+  ],
+  "author": "jeromewus@gmail.com",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/ffmpegwasm/FFmpeg/issues"
+  },
+  "homepage": "https://github.com/ffmpegwasm/FFmpeg#readme"
+}

wasm/tests/multiple-round.test.js

 const fs = require('fs');
 const path = require('path');
-const createFFmpegCore = require('../dist/ffmpeg-core');
+const createFFmpegCore = require('../packages/core/dist/ffmpeg-core');
 const { TIMEOUT } = require('./config');
 const { runFFmpeg, ffmpeg } = require('./utils');
 const IN_FILE_NAME = 'video-1s.avi';

wasm/tests/utils.js

-const createFFmpegCore = require('../dist/ffmpeg-core');
+const createFFmpegCore = require('../packages/core/dist/ffmpeg-core');
 
 const parseArgs = (Core, args) => {
   const argsPtr = Core._malloc(args.length * Uint32Array.BYTES_PER_ELEMENT);