[CHANGE] Updated string maxsize on entities. Setup lib dbcontext

Manager.Data/DataConstants.cs

@@ -0,0 +1,10 @@
+namespace Manager.Data;
+
+public static class DataConstants
+{
+    public static class DbContext
+    {
+        public const int DefaultDbStringSize = 100;
+        public const int DefaultDbDescriptionStringSize = 500;
+    }
+}