feat: implemented SPG registration with fee payer support#373

0xObsidian wants to merge 1 commit intostoryprotocol:mainstoryprotocol/protocol-core-v1:mainfrom

0xObsidian:0xObsidian/SPG-registration-with-fee-payer-support0xObsidian/protocol-core-v1:0xObsidian/SPG-registration-with-fee-payer-supportCopy head branch name to clipboard