* feat: remove invalid email response and instead return email and OTP required to protect against enumeration attacks.
* fix: fixing tests and dotnet format
* feat: add static enumeration helper class
* test: add enumeration helper class unit tests
* feat: implement NeverAuthenticateValidator
* test: unit and integration tests SendNeverAuthenticateValidator
* test: use static class for common integration test setup for Send Access unit and integration tests
* test: update tests to use static helper
* feat: add policy to API startup and Policies class to hold the static strings
* test: add snapshot testing for constants to help with rust mappings
* doc: add docs for send access
