feat: add example TOKEN-404 token contract in Vyper

[0x0077]

What I did

Implemented an example TOKEN-404 token contract in Vyper, demonstrating the basic functionalities of a token contract according to the TOKEN404.

TOKEN404 is commonly referred to as ERC404; however, it does not adhere to the ERC20/ERC721 standard and is instead considered a novel approach.

How I did it

• To avoid naming conflicts between ERC20 and ERC721 events, we need to first deploy an IERC20Event contract.
• Defined the contract interface to include essential functions such as transfer, approve, transferFrom, balanceOf, and allowance.
• Implemented each function strictly following the ERC-20/ERC-721 standard, ensuring compatibility and interoperability with other contracts and wallets expecting ERC-20/ERC-721 compliance.
• Used Vyper safety features and simplicity to create a clear and secure implementation of the token standard.

How to verify it

• Review the contract code in the submitted files.
• Deploy the contract to a test network (e.g., Sepolia or Holesky) using a Vyper-compatible wallet or IDE and interact with it to ensure it behaves as expected.

Commit message

"feat: add example TOKEN-404 token contract in Vyper"

This commit introduces a simple and secure implementation of the TOKEN-404 in Vyper, aimed at developers looking for a straightforward reference for building their tokens.

Description for the changelog

Added an example TOKEN-404 token contract implementation in Vyper, offering developers a template for creating compliant tokens with the security and simplicity of Vyper.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.19%. Comparing base (a9ee641) to head (dbb7d67).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3852   +/-   ##
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  Coverage   86.19%   86.19%           
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  Files          92       92           
  Lines       14013    14013           
  Branches     3078     3078           
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  Hits        12079    12079           
  Misses       1497     1497           
  Partials      437      437           

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