We want to track: Count of edit sessions initiated with one of following URL parameters: &ecenable=suggestions or &ecenable=suggestions,experimental

Currently this isn't logged in any way, but it would be easy to add to VisualEditorFeatureUse as part of the initialization.

Main choice to make is whether to log a single "initialized with: suggestions+experimental" event, or individual events for each feature-flag.

Requirements

(as decided on in standup)

• log any time a session is initialized with suggestions or experimental enabled
  • regardless of the way it was enabled (URL param, force enabled, etc)
  • with a separate log for each parameter (i.e., if both suggestions and experimental are enabled, still expect two separate logs)