feat(world): make fields as keys in events where possible

[itzlambda]

trafficstars

Since having fields as keys can help retrieving events more granular.

In future torii might benefit from this when we add features like whitelist based models/system indexing.

[remybar]

Hi @lambda-0x ! Do you mean adding #[key] attribute on event struct fields in the world contract when it makes sense to do it ?

[itzlambda]

yes, exactly!

[ScottyDavies]

Hello @lambda-0x, please can i work on this?