GreenSmokeNetwork: Prediction Market v2 contract label

[GreenSmokeCustoms-Ai]

Split from #4729. Label for the GSN Prediction Market v2 contract erd1...tulw8w.

Ownership/signature note: asset owner is our 2-of-3 xSafe multisig erd1qqqqqqqqqqqqqpgq7pceh6mvdtkfqwxdnsrcdnxzu22awhtrkgjqn2qtru (self-owned smart contract), which cannot produce an ed25519 message signature, so check-signature cannot auto-resolve a signable owner. We post a signature of the latest commit sha from the project's deployer/operator wallet erd1c83tgujs47scafsu7kyt0myxeg50aw5lzxm47y73ue45ktzfkgjq8m3fae as proof of control - please verify manually or advise your preferred flow for multisig-owned assets.

[GreenSmokeCustoms-Ai]

{
"message": "63393539633037333133646532633531353062376135323264343238616136383735386234396363",
"signature": "024fa36f5ad0cd80a0df68910cb02bf355642a554680f6d03ab55b85dd0626156e06709f77715d0f89307f5c23cfc6785f983dff8be7f60eb74b9a4d415e330e",
"address": "erd1c83tgujs47scafsu7kyt0myxeg50aw5lzxm47y73ue45ktzfkgjq8m3fae",
"version": 1,
"signer": "extension"
}