[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.
```C#
if (actualTypes.Length == 1 &&
    actualTypes[0].IsGenericType() && 
    actualTypes[0].GetGenericTypeDefinition() == typeof(KeyValuePair<,>))
```