AggregateRoot OnDSL and DefaultApplyStrategy always go together

[mostlyobvious]

Yet it is possible to have AggregateRoot.with_strategy(->{ DefaultApplyStrategy.new }) and no OnDSL. This clearly signals needed change.

# include AggregateRoot                                                 | on_, apply_, value.to_s, strict: true
# include AggregateRoot.with(strategy: custom)                          | _  ,      _, value.to_s, _
# include AggregateRoot.with(event_type_resolver: custom)               | _  , apply_, custom,     strict: true  | XXX on_methods missing
# include AggregateRoot.with(strategy: ->{ DefaultApplyStrategy.new })  | _  , apply_, value.to_s, strict: true  | XXX on_methods missing

PS. event_type_resolver refers to #969

[fidel]

I think it's not clear which direction is desired 🤷‍♂️

[fidel]

DefaultApplyStrategy relies on on_methods, so it shouldn't be possible to it separately.