This replaces: #7234

See comments for details: https://github.com/onflow/flow-go/pull/7234/files#r2070382546

Add methods to each of the in-memory caches that returns the core data stored for the type. The persister module will call this method to get all data for the pipeline, then call the BatchStore method for the corresponding storage object to add the entries to a batch.

Some caches maintain multiple values and indexes. The method only needs to return the data required to call the storage object, which may implement similar indexing logic.