title: Why EF Core not set Custom Annotation?
body: <p>In DbContext i declare model as below:</p>
  
  <pre><code>modelBuilder.Entity&lt;FileStore&gt;().Property(x =&gt; x.FileStoreId)
              .ValueGeneratedNever()
              .ForSqlServerHasDefaultValueSql("NewSequentialId()")
              .HasAnnotation("RowGuidColumn", true);
  </code></pre>
  
  <p>but after add migration, HasAnnotation("RowGuidColumn", true) not add any Annotation to Column:</p>
  
  <pre><code> columns: table =&gt; new
              {
                  FileStoreId = table.Column&lt;Guid&gt;(nullable: false, defaultValueSql: "NewSequentialId()"),
                  CreationTime = table.Column&lt;DateTimeOffset&gt;(nullable: false),
              }
  </code></pre>
  
  <p>and i most add Annotation directly:</p>
  
  <pre><code>FileStoreId = table.Column&lt;Guid&gt;(nullable: false, defaultValueSql: "NewSequentialId()").**Annotation("RowGuidColumn", true)**
  </code></pre>
  
  <p>how i can add Annotation that Generate auto in Add-Migration?</p>