[pallet-contracts] Schedule is not public for developer to change the config

[atenjin]

after #8773 Schedule is moved from a storage to outside, but Schedule just provide a Default::default() implementation, but not provide the construct function to set any attribute!

https://github.com/paritytech/substrate/blob/master/frame/contracts/src/schedule.rs#L50-L59

it's attributes are all (crate)

and the Limits and other structs are not public.

For example If I wanna change the max_code_len, I cannot set from the runtime.

[atenjin]

related to #8433

[athei]

The rational for this change is explained in the issue you linked. That said, I intent to add back the ability to fully customize the the Schedule before the next version of this crate is released. But that cannot be accomplished by making the fields public for the reason explained in the linked issue. I will probably write a proc macro that creates versioned constructors that let you set all fields.

Closing because this is subsumed by #8433.