Claim a subsidized account by spending resource credits.
Increments the caller's
pending_claimed_accounts by one.
Accounts claimed using this operation can be created using the
When calling the operation, the account creator has an option to pay the account creation
fee in STEEM or resource credits. If the account creator wants to pay with resource credits, the fee should be 0.000 STEEM,
otherwise, it should match with the
account_creation_fee property set by witnesses.