Update FeatureFlagsOptions and enhance project roadmap

Updated the `FeatureFlagsOptions` to use the `Microsoft.FeatureManagement` package for improved feature management. Added a note to verify the migration of `FeatureFlagsOptions` configuration to the database.

Updated the README.md to reflect the updated project roadmap, which includes migrating to .NET 10, adding multi-tenancy support, implementing endpoints for two-factor authentication and personal data management, and supporting third-party authentication providers.

Outlined tasks for codebase improvements, such as moving claims and module configurations to dedicated libraries, replacing exceptions with operation results, refactoring the email sender service to use Coravel jobs, and making the entity ID type dynamic to support both `INT` and `GUID`.

Reaffirmed the project's MIT License in the README.md.

Author: AngeloDotNet

README.md

@@ -320,7 +320,7 @@ See the [documentation](https://github.com/AngeloDotNet/MinimalApi.Identity/tree
 - [ ] Move the configuration of the module to a dedicated library
 - [ ] Replacing exceptions with implementation of operation results 
 - [ ] Migrate SmtpOptions configuration to database
-- [ ] Migrate FeatureFlagsOptions configuration to database
+- [ ] Migrate FeatureFlagsOptions to Feature Management (package Microsoft.FeatureManagement)
 - [ ] Migrate SwaggerSettings configuration to database
 - [ ] Replacing the hosted service email sender using Coravel jobs
 - [ ] Change the entity ID type from INT to GUID
@@ -334,6 +334,7 @@ See the [documentation](https://github.com/AngeloDotNet/MinimalApi.Identity/tree
 - [ ] Add endpoints for two-factor authentication and management
 - [ ] Add endpoints for downloading and deleting personal data
 - [ ] Add authentication support from third-party providers (e.g. Auth0, KeyCloak, GitHub, Azure)
+- [ ] Migrate FeatureFlagsOptions configuration to database (to be verified)
 
 ## 📜 License