segmentChangesUpdater - limit concurrency

[scottbessler]

Javascript commons library

What did you accomplish?

Segment fetching was currently doing a Promise.all across every segment on startup. This would result in [# of segments] simultaneous IO requests, which can cause troubles for node. It is better to ensure a max # of concurrent requests.

• converted the segmentChangesUpdater to use async/await syntax instead of promise chains
• updated .editorconfig to include quote preference
• made the segment fetching happen in chunks of 10 rather than all at once
• added configuration option numConcurrentSegmentFetches and defaulted it to 10

How do we test the changes introduced in this PR?

• ensure segment syncing still works

Extra Notes