Add EIP-5727: Semi-Fungible Soulbound Token (#5727)

* feat: upload eip draft

* fix: update erc number

* feat: upload assets

* fix: update implementation link

* fix: update author info

* feat: upload sample implementation

* fix: add hardhat project config

* fix: revise eip-5727

* fix: change ERC to EIP

* fix: fix links to eip

* fix: update tests

* feat: include interface id; update sample

assets/eip-5727/.gitignore

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