feat: Updates to use swift-validations for database.

Sources/DatabaseClient/Internal/Model+validateAndSave.swift

@@ -0,0 +1,10 @@
+import Fluent
+import Validations
+
+extension Model where Self: Validations.Validatable {
+
+  func validateAndSave(on database: any Database) async throws {
+    try self.validate()
+    try await self.save(on: database)
+  }
+}