chore: use babel project-wide configuration

Author: Garfield550

babel.config.json

@@ -0,0 +1,50 @@
+{
+  "overrides": [
+    {
+      "include": "packages/taro-ui-demo/**",
+      "presets": [
+        [
+          "taro",
+          {
+            "framework": "react",
+            "ts": true
+          }
+        ]
+      ]
+    },
+    {
+      "include": "packages/taro-ui-docs/**",
+      "presets": [
+        [
+          "@babel/preset-env",
+          {
+            "spec": true,
+            "modules": false,
+            "targets": {
+              "browsers": [
+                "ie >= 9",
+                "Chrome >= 21",
+                "Firefox >= 1",
+                "Edge >= 13",
+                "last 3 versions"
+              ]
+            },
+            "loose": false,
+            "forceAllTransforms": true,
+            "useBuiltIns": "entry"
+          }
+        ]
+      ],
+      "plugins": [
+        "@babel/plugin-syntax-dynamic-import",
+        "@babel/plugin-proposal-class-properties",
+        [
+          "@babel/plugin-transform-react-jsx",
+          {
+            "pragma": "React.createElement"
+          }
+        ]
+      ]
+    }
+  ]
+}