feat(modules): standalone erc20 with own store

[TamaraRingas]

Create an ERC20 token template that is compatible with the MUD framework. The logic of the token contract should remain near native and still reside within the token contract, while its storage should be refactored to use Store and be reflected in corresponding tables.

The OpenZeppelin implementation of ERC20 will be used as reference but tests shall be written in Solidity.

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