feat: make deep link handling more flexible

This adds ability to specify a custom config to control how to convert between state and path.

Example:

```js
{
  Chat: {
    path: 'chat/:author/:id',
    parse: { id: Number }
  }
}
```

The above config can parse a path matching the provided pattern: `chat/jane/42` to a valid state:

```js
{
  routes: [
    {
      name: 'Chat',
      params: { author: 'jane', id: 42 },
    },
  ],
}
```

This makes it much easier to control the parsing without having to specify a custom function.

package.json

@@ -31,7 +31,7 @@
     "@types/jest": "^24.0.13",
     "codecov": "^3.5.0",
     "commitlint": "^8.0.0",
-    "core-js": "^3.1.4",
+    "core-js": "^3.2.1",
     "eslint": "^5.16.0",
     "eslint-config-satya164": "^2.4.1",
     "husky": "^2.4.0",