Make Container a valid ERC721 and ERC1155 receiver

[gabrielstoica]

Context

As we want our Container.sol contract to act as a true vault for users, we should allow anyone to also deposit ERC-721 or ERC-1155 tokens, apart from ERC-20 tokens and native ETH.

Changelog

This PR adds new functionalities as follows:

• onERC721Received hook required for any contract to be IERC721Receiver compliant;
• onERC1155Received and onERC1155BatchReceived hooks required for any contract to be IERC1155Receiver compliant;
• withdrawERC721 method to allow ERC-721 token withdrawal by the Container owner;
• withdrawERC1155 method to allow single and batch ERC-1155 token(s) withdrawal by the Container owner;
• according events;
• tests to handle the new functionalities;

Other unrelated add-ons:

• fallback method on the Container.sol contract to emit NativeReceived event when ETH is sent to the contract with data or a function is called that doesn't exist in the contract;

task: none

[V1d0r]

Great call! The container can be used as a vault so should support holding all native tokens.