Add optional "org" to feature view

**Is your feature request related to a problem? Please describe.**
Need a way to group features around organization. Organization is lower granularity than project which can a natural user-defined feature grouping category.

**Describe the solution you'd like**
Adding organization as a string to feature view allows features to be queried by organization.

**Describe alternatives you've considered**
Store org as entry in tags map but then not easily queryable across lots of feature definitions

**Additional context**
Need to support this at feature registry service level through API