[Partial fix for #1372]Added SimpleTypesExcludeFilter to exlcude validat...

...ion on simple types and also added tests to cover scenarios.

@yishaigalatzer @pranavkm @rynowak @harshgMSFT 

Note:
- This PR does not have comments. I will add them once we agree upon the changes.
Too long of a line and unreadable. Break it up, and use Assert.Single.

```
var resposeContent = JsonConvert.DeserializeObject<ResponseContent>(body);
var error = Assert.Single(responseContent.Suppliers.Errors);
Assert.Equal(expectedModelStateErrorMessage, errorMessage);
```