[Change Proposal] Support same data stream settings in transforms as in other manifests

While migrating Elasticsearch package to spec 3.x in https://github.com/elastic/integrations/pull/12156 we have found that some data stream settings are not available, for example is not possible to configure the source mode or the number of shards, what is available in other manifests.

Transform manifest have their own spec for data stream settings, we should probably be consistent, supporting the same options in all the cases.

Support the same options as in other manifests, checking if changes would be required in fleet for that.