Typed Get 
by Anthony Fu @antfu
The [`get` function in lodash](https://lodash.com/docs/4.17.15#get) is a quite convenient helper for accessing nested values in JavaScript. However, when we come to TypeScript, using functions like this will make you lose the type information. With TS 4.1's upcoming [Template Literal Types](https://devblogs.microsoft.com/typescript/announcing-typescript-4-1-beta/#template-literal-types) feature, properly typing `get` becomes possible. Can you implement it?
For example,
```ts
type Data = {
foo: {
bar: {
value: 'foobar',
count: 6,
},
included: true,
},
hello: 'world'
}
type A = Get // 'world'
type B = Get // 6
type C = Get // { value: 'foobar', count: 6 }
```
Accessing arrays is not required in this challenge.
