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LSIF: Update logging

Administrator requested to merge lsif-logging-pass into master

Created by: efritz

This PR moves all of the logAndTraceSpan to the "leaves" of the callstack where the work is non-trivial. This will help us better pin-point which of these atomic operations are happening too frequently or taking too long to occur. The following are logged:

  • all gitserver requests
  • all jobs
  • all steps of importing a dump (correlation, canonicalization, insertion of docs, result chunks)
  • insertion of dump/packages/references into the cross-repo database
  • non-trivial cross-repo queries: closest-commit, update tips, update commits
  • all public methods of database (defs, refs, hover, rangeByPosition, and monikerResults)

Previously we logged some of these, but some were collapsed into larger spans, which can hide the reason a request or job can take a long time.

This additionally adds metrics around gitserver requests.

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