[FEATURE] improve `noro6` share button

[andychucs]

noro6

easy to implement, just make a factory method toApiData Ship and Equipment entities. and call them in Fleet.ships

I will not work for this issue during few weeks. if someone want be assigned, please let me know.

squad page support share the deckbuilder parameter for now, improve it to add items and ships data in parameters can be able to import data to noro6.

https://github.com/andychucs/conning_tower/issues/311

https://noro6.github.io/kc-web#import:{"predeck":{...},"ships":[{"api_ship_id":1,"api_lv":1,"api_kyouka":[0,0,0,0,0,0,0],"api_exp":[0,100,0],"api_slot_ex":0,"api_sally_area":0}],"items":[{"api_slotitem_id":1,"api_level":10}]}

https://github.com/andychucs/conning_tower/blob/4de861af95b15fdab33c130b2c660dc4064633cb/lib/widgets/squads_share_button.dart#L63