Add QuestDb

Providers/FreeSql.Provider.QuestDb/Subtable/AutoSubtableAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace FreeSql.Provider.QuestDb.Subtable
+{
+    [AttributeUsage(AttributeTargets.Property, Inherited = true)]
+    public class AutoSubtableAttribute : Attribute
+    {
+        public SubtableType? SubtableType
+        {
+            get; set;
+        }
+        public AutoSubtableAttribute(SubtableType type)
+        {
+            SubtableType = type;
+        }
+    }
+}

Providers/FreeSql.Provider.QuestDb/Subtable/SubtableType.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace FreeSql.Provider.QuestDb.Subtable
+{
+    public enum SubtableType
+    {
+        Year = 1,
+        Month = 2,
+        Day = 3,
+        Hour = 4,
+        Second = 5,
+        Minute = 6,
+        Millisecond = 7,
+        Weekday = 8,
+        Quarter = 9
+    }
+}