CAMEL-16594 Support more than one active shard in DynamoDB stream.

[PyvesB]

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This pull request achieves the following:

• drops support for the iteratorType and sequenceNumberProvider parameters. My reasoning as to why these don't make much sense can be found in CAMEL-16594.
• adds support for a new streamIteratorType parameter which can have two values, FROM_LATEST and FROM_START.
• models DynamoDB stream shards as a tree rather than a list and adds some unit tests to this shard data structure.
• reworks ShardIteratorHandler to operate on a tree structure and adds unit tests to it.
• reworks Ddb2StreamConsumer to operate on multiple returned shard iterators.

[oscerd]

Looks good to me. Thanks a lot for the work. @davsclaus can you have a look too? Thanks

[davsclaus]

Can you add a note to the 3.12 upgrade guide about the option renamed
https://github.com/apache/camel/blob/main/docs/user-manual/modules/ROOT/pages/camel-3x-upgrade-guide-3_12.adoc

[oscerd]

I'm going to merge this today. I think it would be really nice to have a blog post about how to use this and maybe a bit more love to this component.

[oscerd]

Merged. Thanks!