Add option to register custom class serializers

### Use case
Want to insert data structured as List> without having to covert every row to a dto object and provide getters.
This kind of structure typically comes from query resultset, csv parser, apache camel exchange etc. The map is of column name to value.

### Describe the solution you'd like
Be able to register a class serializer for Map with POJOSerializers which calls Map.get("column") with the appropriate cast.
Alternatively add built in serializer option that handles List> type
Or possibly have the register method detect get(column-name) methods as valid serialization methods

also allow java record getter methods (which don't start with "get") to act as serialization methods

まず POJOSerializers とその register メソッドを読み、要求されている Map.get("column") の処理を、Java record の getter メソッドのサポートと比較してください。この issue では複数の代替設計が提示されているため、完了とするには、まず実装前に 1 つのシリアライズ動作を選択して仕様化する必要があります。

索引モデルが issue の本文から書いたものです。