message: Add apurvans as SQL code owner
diff: /specification/service-map/ @daveirwin1
  /specification/servicebus/ @sazeesha @v-ajnava
  /specification/servicefabric/ @juhacket @samedder
  -/specification/sql/ @jamestao @bcham
  +/specification/sql/ @jamestao @bcham @apurvans
  /specification/storage/ @blueww @jasonyang-msft @xiaonlimsft
  /specification/storage/data-plane/ @kasobol-msft @seanmcc-msft
  /specification/storageimportexport/ @leoz-ms
  