Feat/eip-2981 royalties

[carlomigueldy]

EIP-2981 Implementation (Secondary Market Shares / Royalties)

This PR is specifically for adding support to royalties via EIP-2981 standard. This is specific to OpenSea royalties implementation.

Here are the references I've used to learn its implementation from the past few months:

• GitHub Repository: EIP2981-implementation
• Forum Post form OpenZeppelin: "Has anyone implemented EIP 2981"
• A Gemini Article: "Exploring the NFT Royalty Standard (EIP-2981)"
• Official Document from Ethereum: "EIP-2981: NFT Royalty Standard "
• Medium Post: "EIP-2981 — Simple and effective royalty standard for all"
• And finally... a useful YouTube video tutorial: "Custom ERC721 With Secondary Royalties (OpenSea, Rarible, Mintable) - From Scratch with Truffle"

I hope these resources helps out for anyone interested to learn more about the secondary market shares preparation/implementation on a smart contract.

Closes #110

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[carlomigueldy]

Thanks for the review brothers @noahliechti @itstargetconfirmed :)