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job-info: support new update-lookup/watch service
Problem: In the future, several services will need to know a job's resources and know the updates that would apply to them. This would currently require users to read R, read the eventlog, and then apply `resource-update` events to R. Some other users would also need to know when there are changes to R, necessitating watching the eventlog for future resource-update changes. It would be nice if a service did this as there will be multiple users. Solution: Support a new job-info.update-lookup service and job-info.update-watch streaming service. It currently supports only the key "R", but can be extended to other keys in the future. The job-info.update-lookup service will read R and the eventlog for a job. it then apples all resource-update changes to R and returns the result. job-info.update-watch service will do the same as the above, but if the job is not completed, it will continue to watch the eventlog for future resource-update events. On each new resource-update event, a new R will be streamed back to the caller. This continues until the job ends or the caller cancels the stream. Fixes flux-framework#5451
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