message: update extension codeowners
diff: @@ -65,6 +65,8 @@ rush.json @iTwin/itwinjs-core-admins
  /common/**/core-common/ @iTwin/itwinjs-core-admins @iTwin/itwinjs-core-display
  /common/**/editor-*.* @bbastings @kabentley @pmconne
  /common/**/editor-*/ @bbastings @kabentley @pmconne
  +/common/**/core-extension.* @calebmshafer @wgoehrig @aruniverse @kckst8 @johnnyd710
  +/common/**/core-extension/ @calebmshafer @wgoehrig @aruniverse @kckst8 @johnnyd710
  /common/**/core-frontend.* @kabentley @bbastings @iTwin/itwinjs-core-display
  /common/**/core-frontend/ @kabentley @bbastings @iTwin/itwinjs-core-display
  /common/**/core-i18n.* @calebmshafer @wgoehrig
  @@ -105,9 +107,9 @@ rush.json @iTwin/itwinjs-core-admins
  /core/ecschema-* @calebmshafer @ColinKerr @wgoehrig
  /core/electron @wgoehrig @ramanujam-raman
  /core/express-server @calebmshafer @wgoehrig @ramanujam-raman
  -/core/extension @calebmshafer @wgoehrig @aruniverse @kckst8
  +/core/extension @calebmshafer @wgoehrig @aruniverse @kckst8 @johnnyd710
  /core/frontend @kabentley @bbastings @iTwin/itwinjs-core-display
  -/core/frontend/src/extension @calebmshafer @wgoehrig @aruniverse @kckst8
  +/core/frontend/src/extension @calebmshafer @wgoehrig @aruniverse @kckst8 @johnnyd710
  /core/frontend-devtools @iTwin/itwinjs-core-display @Ellord207
  /core/geometry @bbastings @mgooding @dassaf4
  /core/hypermodeling @bbastings @iTwin/itwinjs-core-display
  