Safe + whitelisting

[porkbrain]

Implementation of a proposal mentioned in this comment: MystenLabs/sui#4887 (comment)

[nmboavida]

One implication of logical ownership:

In the case of embedded NFTs, they are currently being preminted to the Launchpad and therefore they initially exist in a state where they do not have logical owner until they get bought.

One solution is to change to flow as follows:

1. Instead of NFT creators preminting the NFT to the launchpad, they will instead only create the Data object.
2. When the buyers purchase an NFT certificate, the launchpad will mint the NFT object initially as loose and then will call the function nft::join_nft_data to transform the loose NFT into an embedded NFT

[nmboavida]

One implication of logical ownership:

In the case of embedded NFTs, they are currently being preminted to the Launchpad and therefore they initially exist in a state where they do not have logical owner until they get bought.

One solution is to change to flow as follows:

1. Instead of NFT creators preminting the NFT to the launchpad, they will instead only create the Data object.
2. When the buyers purchase an NFT certificate, the launchpad will mint the NFT object initially as loose and then will call the function nft::join_nft_data to transform the loose NFT into an embedded NFT

In fact this means that the interaction surface can be significantly simplified as the embedded and loose NFTs will have pretty much the same flow from an interface standpoint

[porkbrain]

TODO:

• emit events
• changelog
• docs
• some listing strategies such as blacklist or free-for-all
• expose relevant entry functions

[nmboavida]

Fast-tracking to merge all to develop, let us add TODOs so we can tackle stuff in the next iterations