Added suuport to inject an IOqtaneDatabase in EntityBuilders to allow each Database to control certain Migration behaviors. Also updated Installer to dynamically build Database Configuration section

Oqtane.Server/Databases/SqlServerDatabaseBase.cs

@@ -0,0 +1,39 @@
+using System.Collections.Generic;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Migrations.Operations;
+using Microsoft.EntityFrameworkCore.Migrations.Operations.Builders;
+using Oqtane.Interfaces;
+using Oqtane.Models;
+
+namespace Oqtane.Repository.Databases
+{
+    public abstract class SqlServerDatabaseBase : IOqtaneDatabase
+    {
+        protected SqlServerDatabaseBase(string name, string friendlyName, List<ConnectionStringField> connectionStringFields)
+        {
+            Name = name;
+            FriendlyName = friendlyName;
+            ConnectionStringFields = connectionStringFields;
+        }
+
+        public  string FriendlyName { get; }
+
+        public string Name { get; }
+
+        public string Provider => "Microsoft.EntityFrameworkCore.SqlServer";
+
+        public List<ConnectionStringField> ConnectionStringFields { get; }
+
+        public OperationBuilder<AddColumnOperation> AddAutoIncrementColumn(ColumnsBuilder table, string name)
+        {
+            return table.Column<int>(name: name, nullable: false).Annotation("SqlServer:Identity", "1, 1");
+        }
+
+        public abstract string BuildConnectionString();
+
+        public DbContextOptionsBuilder UseDatabase(DbContextOptionsBuilder optionsBuilder, string connectionString)
+        {
+            return optionsBuilder.UseSqlServer(connectionString);
+        }
+    }
+}