ICodeFirst 增加 ConfigEntity 方法，现实干净实体无特性的需求

FreeSql.Tests/DataAnnotations/FluentTest.cs

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+using FreeSql.DataAnnotations;
+using Xunit;
+
+namespace FreeSql.Tests.DataAnnotations {
+	public class FluentTest {
+		[Fact]
+		public void Fluent() {
+			g.mysql.CodeFirst
+				.ConfigEntity<TestFluenttb1>(a => {
+					a.Name("xxdkdkdk1").SelectFilter("a.Id22 > 0");
+					a.Property(b => b.Id).Name("Id22").IsIdentity(true);
+					a.Property(b => b.name).DbType("varchar(100)").IsNullable(true);
+				})
+				.ConfigEntity<TestFluenttb2>(a => {
+					a.Name("xxdkdkdk2").SelectFilter("a.Idx > 0");
+					a.Property(b => b.Id).Name("Id22").IsIdentity(true);
+					a.Property(b => b.name).DbType("varchar(100)").IsNullable(true);
+				});
+
+			var ddl1 = g.mysql.CodeFirst.GetComparisonDDLStatements<TestFluenttb1>();
+			var ddl2 = g.mysql.CodeFirst.GetComparisonDDLStatements<TestFluenttb2>();
+
+			var t1id = g.mysql.Insert<TestFluenttb1>().AppendData(new TestFluenttb1 { }).ExecuteIdentity();
+			var t1 = g.mysql.Select<TestFluenttb1>(t1id).ToOne();
+
+			var t2lastId = g.mysql.Select<TestFluenttb2>().Max(a => a.Id);
+			var t2affrows = g.mysql.Insert<TestFluenttb2>().AppendData(new TestFluenttb2 { Id = t2lastId + 1 }).ExecuteAffrows();
+			var t2 = g.mysql.Select<TestFluenttb2>(t2lastId + 1).ToOne();
+		}
+	}
+
+	class TestFluenttb1 {
+		public int Id { get; set; }
+
+		public string name { get; set; } = "defaultValue";
+	}
+
+	[Table(Name = "cccccdddwww")]
+	class TestFluenttb2 {
+		[Column(Name = "Idx", IsPrimary = true, IsIdentity = false)]
+		public int Id { get; set; }
+
+		public string name { get; set; } = "defaultValue";
+	}
+}