Make NodeMap Thread-safe
          #487
        
          
      
                
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Description of changes:
Makes the
NodeMapthread-safe; this is a per-requisite for using the structure in thePartiQLShapeBuilder. It usesDashMapandVecunder the hood. It uses theVecfor preserving the ordering as the previous implementation was usingIndexMap.IndexMapdoes not seem to be thread-safe.The PR also makes necessary changes to preserve the behavior of the current
NodeMapdependencies.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.