* 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**: create `SendGrantValidator` and initial `SendPasswordValidator` for Send access grants
**feat**: add feature flag to toggle Send grant validation logic
**feat**: add Send client to Identity and update `ApiClient` to generic `Client`
**feat**: register Send services in DI pipeline
**feat**: add claims management support to `ProfileService`
**feat**: distinguish between invalid grant and invalid request in `SendAccessGrantValidator`
**fix**: update parsing of `send_id` from request
**fix**: add early return when feature flag is disabled
**fix**: rename and organize Send access scope and grant type
**fix**: dotnet format
**test**: add unit and integration tests for `SendGrantValidator`
**test**: update OpenID configuration and API resource claims
**doc**: move documentation to interfaces and update inline comments
**chore**: add TODO for future support of `CustomGrantTypes`
* feat : remove old registration endpoint
* fix: update integration test user registration to match current registration; We need to keep the IRegistrationCommand.RegisterUser method to JIT user.
* fix: updating accounts/profile tests to match current implementations
* feat(BaseRequestValidator):
Add global setting for new device verification.
Refactor BaseRequestValidator enabling better self-documenting code and better single responsibility principle for validators.
Updated DeviceValidator to handle new device verification, behind a feature flag.
Moved IDeviceValidator interface to separate file.
Updated CustomRequestValidator to act as the conduit by which *Validators communicate authentication context between themselves and the RequestValidators.
Adding new test for DeviceValidator class.
Updated tests for BaseRequestValidator as some functionality was moved to the DeviceValidator class.
