Implement `MapTypes` which will transform types in object T to different types defined by type R which has the following structure
```ts
type StringToNumber = {
mapFrom: string; // value of key which value is string
mapTo: number; // will be transformed for number
}
```
## Examples:
```ts
type StringToNumber = { mapFrom: string; mapTo: number;}
MapTypes<{iWillBeANumberOneDay: string}, StringToNumber> // gives { iWillBeANumberOneDay: number; }
```
Be aware that user can provide a union of types:
```ts
type StringToNumber = { mapFrom: string; mapTo: number;}
type StringToDate = { mapFrom: string; mapTo: Date;}
MapTypes<{iWillBeNumberOrDate: string}, StringToDate | StringToNumber> // gives { iWillBeNumberOrDate: number | Date; }
```
If the type doesn't exist in our map, leave it as it was:
```ts
type StringToNumber = { mapFrom: string; mapTo: number;}
MapTypes<{iWillBeANumberOneDay: string, iWillStayTheSame: Function}, StringToNumber> // // gives { iWillBeANumberOneDay: number, iWillStayTheSame: Function }
```
