Create a scroll service

We need a service to retrieve a long list of identifiers representing a result set.

There are already scroll API in the repository to list document ids:

• nuxeo-core-api CoreSession
  • ScrollResult<String> scroll(String query, int batchSize, int keepAliveSeconds);
  • ScrollResult<String> scroll(String scrollId);

And in elasticsearch

• nuxeo-features/nuxeo-elasticsearch ElasticSearchServiceImpl
  • EsScrollResult scroll(NxQueryBuilder queryBuilder, long keepAlive)
  • EsScrollResult scroll(EsScrollResult scrollResult)

This could be 2 contributions of a scroll service, so the client doesn't have to use different API.

Also, It could be interesting to have other document scrollers:

• a list of ids (so we don't have to query the repository or elastic)
• a file in transient store containing a list of ids

Or to scroll on non-documents identifier:

• audit entry ids
• user ids
• dictionary ids
• a stream

A possible client usage can be:

ScrollRequest request = DocumentScrollRequest.builder("Select * from Document").scroll("elastic").size(10).username("bob").build();
try (Scroll scroll = service.scroll(request)) {
  while (scroller.fetch()) {
     List<String> ids  = scroller.getIds();
     // ...
  }
}

// Same request but using the repository search:
ScrollRequest request = DocumentScrollRequest.builder("Select * from Document").scroll("repository").size(10).build();

// Static identifier list
ScrollRequest request = StaticScrollRequest.builder("docid1,docid2").size(10).build();

// A file containing a list of ids
Scroller<String> fileScroller = FileScrollRequest.builder("path/to/id-list.txt").build();

// Querying the audit
Scroller<String> auditScroller = AuditScrollRequest.builder("entryId > 1234").size(10).build();
Scroller<String> auditScroller = AuditScrollRequest.builder("entryDate > now - 1d").size(10).build();