feat: allow to selectively update items

[Xavier59]

The DynamoDB paradigm is to have a single database per service.
This mean that a table can contain different kind of entities and often, you don't want to update all the entities.

This PR make it possible to selectively transform entries, e.g:

  const addNewFieldsToUser = (item) => {
    if (item.pk.startsWith("user#")) {
      const updatedItem = {
        ...item,
        surname: "Tom"
      };
      return updatedItem;
    }
    return undefined;

  };

[jit-ci]

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[Guy7B]

Thanks! @Xavier59

Good idea