Capacity Network Staking Consumer

[enddynayn]

Description
A user should be unable to claim their existential deposit if they have not removed all storage from the Capacity pallet.

Notes
When a user stakes to the network the consumer counter should be increased to let other modules know that the capacity pallet depends on the user's existence.

https://substrate.stackexchange.com/questions/263/what-is-the-meaning-of-the-account-provider-sufficients-and-consumer