Update Tesseract.js (#14708)

* [WiP] Update Tesseract.js

- Update Tesseract.js to 2.2.1
- Use versioned file names
- differentiate two progression states: preparing OCR and detecting picture

* Get rid of copy-webpack-plugin

config/webpack/rules/tesseract.js

@@ -0,0 +1,14 @@
+module.exports = {
+  test: [
+    /tesseract\.js\/dist\/worker\.min\.js$/,
+    /tesseract\.js\/dist\/worker\.min\.js.map$/,
+    /tesseract\.js-core\/tesseract-core\.wasm$/,
+    /tesseract\.js-core\/tesseract-core\.wasm.js$/,
+  ],
+  use: {
+    loader: 'file-loader',
+    options: {
+      name: 'ocr/[name]-[hash].[ext]',
+    },
+  },
+};