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repo-updater: Tune pagination params in Store

Administrator requested to merge core/tune-store-pagination into master

Created by: tsenart

This commit introduces Limit and Page parameters on StoreListReposArgs which allow callers to specify the page size and the total limit of returned repos by ListRepos.

Additionally, it also changes the default page size from 500 to 10000. The reason for this is that in most configurations, the network roundtrip and marshalling overhead dominates the total time taken to list the desired number of repositories.

The value of 10000 has been empirically found with a helper program that listed repos in sourcegraph.com with different Limit and Page parameters.

  • Page=500 Limit=20000: 15.699724879s
  • Page=5000 Limit=20000: 3.924060726s
  • Page=10000 Limit=20000: 1.106930741s
  • Page=20000 Limit=20000: 3.208471686s

This should fix one part of the performance regressions reported by @slimsag yesterday.

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