[PG-1635] Return void from add/change key provider functions #376
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The returned provider id was not useful for end-users as they cannot do anything with it. They always use the provider name when interacting with these settings.
If they really want to see these ids they can easily just use the functions to list all providers to see them.
The reason for this change is that it might be confusing for users when the function to create a global provider returns -1 on success without any indication that it's just the generated id and not an error code.