Events to update CoinMetadata (PR)

I’ve created a PR which introduces events for coinmetadata updates; please lmk if I missed something or you think it’s not worth the hassle; feat: fire event after metadata update by d-moos · Pull Request #7823 · MystenLabs/sui · GitHub
currently indexing coinmetadata is possible but the off-chain list becomes out of date as soon as any of the update functions is called.

(tried to post it in discord instead of the forums as I feel this is very minor, but the word-filter auto-deletion is just too much for me to handle :))