feat: Add MJML email templates for Send Email OTP
feat: Implement MJML-based email templates for Send OTP functionality
feat: Add feature flag support for Send Email OTP v2 emails
feat: Update email view models and call sites for Send Email OTP
fix: Modify the directory structure for MJML templates to have Auth directory for better team ownership
fix: Rename `hero.js` to `mj-bw-hero.js`
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Co-authored-by: Todd Martin <106564991+trmartin4@users.noreply.github.com>
* 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
**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`
