DynamoDbEnhancedClient support for multiple type mapping

[rossginn]

Allow inserting into a single table multiple types that implement a generic record interface defining PK and SK.

Describe the Feature

For tables containing many to one relationships, a SK convention such as type#id can be used to link adjacent documents.
For example, if GenericRecord interface defined PK and SK getters:

PK: Amazon SK: company#123abc -> Company implements GenericRecord
Pk: Amazon SK: employee#789xyz -> Employee implements GenericRecord

Ability to create single flexible mapper/client and insert both types in order.

Is your Feature Request related to a problem?

It appears this may be possible with StaticTableSchema, but seems like a lot of unintuitive setup. It appears v1 SDK approach is simpler.

[debora-ito]

@rossginn is this the same ask as #2151?

[github-actions]

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