[Design] - Prototype of ResourceModel

/cc @yishaigalatzer @harshgMSFT 

Not included here:
- Model Metadata integration
- Sample generation interface
- Filter interface for customizing formatters
- Xml Documentation access

Where possible I made decisions that are similar to webapi api explorer. See comments in the code for context on specific decision points and open questions.
would it always be query ? can it come from route data ? or is it just a basic implementation for prototype.