What is the feature you would like to see?

The contract in question is examples/erc721/tests/mock/receiver.rs > ERC721ReceiverMock.

Since PR #729, it is possible to deploy custom Stylus contracts in e2e. We can use this to replace this mock Solidity contract with a new Erc721Holder example contract in the ./examples/ directory.

This achieves a couple of things:

1. Mock contract is now written in Stylus and used in e2e, further increasing contract library reliability.
2. Users get to see an example Erc721Holder implementation.

A single e2e test would be sufficient to verify that the contract example is deployable.

TODO:

• Implement examples/erc721-holder/
• Implement at least a single e2e test verifying the contract can be deployed and that it returns the expected RECEIVER_FN_SELECTOR value.
• Replace ERC721ReceiverMock Solidity contract usage in erc721 e2e tests (to see how another example can be deployed in e2e tests, see example/beacon-proxy)
• Remove ERC721ReceiverMock.

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