Changes to Create campaign

the sequences/items/steps/items/delay request property's max was set to 527040.00

the sequences/items/steps/items/pre_delay request property's max was set to 527040.00

the sequences/items/steps/items/delay request property's min was set to 0.00

the sequences/items/steps/items/pre_delay request property's min was set to 0.00

added the optional property created_by to the response with the 200 status