Use ABP Standard Application Endpoints

Use ABP's built-in application-configuration and application-localization HTTP endpoints, and extend them with an IApplicationConfigurationContributor. USE FOR: reading /api/abp/application-configuration (current user, granted policies, settings, features, multi-tenancy, timing) and /api/abp/application-localization from a custom client; extending the config with IApplicationConfigurationContributor and AbpApplicationConfigurationOptions. DO NOT USE FOR: publishing your own application services as controllers (use expose-http-apis); calling remote ABP APIs with C# client proxies (use consume-remote-services); consuming the config in Angular/Blazor/MVC startup (use the per…