Add support for authorization (authentication)

**Is your feature request related to a problem? Please describe.**
Provide restrictions based on authentication. 

**Describe the solution you'd like**
- Require the user to be authorized to access a data context and/or collection.
- Provide a callback for fine-grained access based on role, claims, etc.

**Describe alternatives you've considered**
N/a

**Additional context**
N/A
