feat: Implement API client and token models with hashing and JWT authentication

- Added ApiClientModel and ApiTokenModel for managing API clients and tokens.
- Introduced ConfigurationDefinitionModel and ConfigurationValueModel for configuration management.
- Created CredentialSecretModel for storing credential secrets.
- Developed DeploymentArtifactModel and DeploymentBatchModel for deployment management.
- Enhanced DeploymentTargetModel and DeploymentTemplateSelectionModel to support template revisions.
- Added TemplateRevisionModel and TemplateVersionModel for versioning templates.
- Implemented ApiClientSecretHasher for secure secret hashing.
- Created ApiTokenService for generating and validating JWT tokens.
- Updated QueueJobService to handle deployment requests with artifacts.
- Configured authentication settings in appsettings.json for JWT and Negotiate authentication.

Dto/Auth/TokenRequestDto.cs

@@ -0,0 +1,9 @@
+namespace Microsoft.SelfService.Portal.Core.API.Dto.Auth
+{
+    public class TokenRequestDto
+    {
+        public string ClientId { get; set; } = string.Empty;
+        public string ClientSecret { get; set; } = string.Empty;
+        public string? Scope { get; set; }
+    }
+}