[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.
user-defined value types should be included. But, I added tests for the collections for nullable types like int?[]. 

Thanks