Efcore: Making DbContext Proxyable

[mnver1]

Sorry if this is the wrong place to post this.

I proxy DbContext for several purposes but I recently tried v5.0 and noticed that it introduces 3 non-virtual members which make DbContext less proxyable.

public event EventHandler<SavingChangesEventArgs> SavingChanges;
public event EventHandler<SavedChangesEventArgs> SavedChanges;
public event EventHandler<SaveChangesFailedEventArgs> SaveChangesFailed;

I hope you consider making them virtual.

[AndriySvyryd]

@mnver1 Event overriding behavior is undefined in C#. Consider hiding them instead.