joyboy : Claim_to (#192)
* add claim_to function with starknet recipient in nostr event content
* clean claim to
* change contract address + rename
* format to felt into encode function + change signature claim_to
* scarb fmt
https://github.com/keep-starknet-strange/joyboy/commit/de0956e63a4d3aba52e6a650cb3f17b3712cfdab