JobStatusProvider should lazy load events when returning
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                 Key: SLING-1687
                 URL: https://issues.apache.org/jira/browse/SLING-1687
             Project: Sling
          Issue Type: New Feature
          Components: Extensions
    Affects Versions: Extensions Event 2.3.0
            Reporter: Carsten Ziegeler
            Assignee: Carsten Ziegeler
             Fix For: Extensions Event 2.4.0


The current implementation of the job status provider does a query, then loads 
all jobs and returns a list.
If you just want to know how many jobs are available or just want to return the 
first X jobs, the implementation is too expansive.

One solution would be to return a kind of range iterator instead of a list and 
load jobs on demand. There are two potential problems:
- if the jcr query does not return a count, we can't return a count either 
without going through the hole result set
- it might be that a job can't be loaded because of missing classes; in this 
cases the job count from the query result is higher than the count of the jobs 
that get processed. I think we can neglect this 

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