TypeError: on using model for dataset.source

### Version
5.0.2

### Steps to reproduce
Suppose we have a model for data like below
```javascript
export class SourceTestModel {
'xValue': string;
'yValue': number;
}

data: SourceTestModel[] = [ // If we are getting this from api
{xValue: first, yValue: 25},
{xValue: second, yValue: 50}
];
```
And we use this data in dataset.source like
```javascript
dataset: {
dimensions: ['xValue', 'yValue'],
source: data // Throws type error
}
```

### What is expected?
It should not through any typescript errors

### What is actually happening?
Type 'SourceTestModel[]' is not assignable to type 'OptionSourceData>'