* Initial start to notifications API (#215)

* initial start to notifications API

* fixing some styling

* fixed lint errors

* update types

* added tests

* linter, moved notification types

* addressed comments regarding imports/enum naming

* fixed alphabetical order

* Notifs post email functionality (#222)

* initial start to notifications API

* fixing some styling

* fixed lint errors

* update types

* added tests

* linter, moved notification types

* added template support

* made changes to reflect private changes

* added helper function

* fixed lint issue

* addressed comments, added some type checking and cleaned up comments

* testing removing test

* fixed linter

* fixed lint

* fixed linting issues

* skip type checking

* fixed lint

* fixed typing on get request args

* removed typing for get request to fix lint issues

* fixed linter again

* re added test

* raise except...