[evm] Use the ERC20 metadata to set the Name and display for a Bank Coin

[Unique-Divine]

In the context of FunToken mapping creation:

I'm wondering why the retrieved erc20 metadata is not used here to set Name to the erc20 token's name?

Context:

• x/evm/keeper/funtoken_from_erc20.go#L118-L132

Description:

In createFunTokenFromERC20(), the bank metadata for the new funtoken coin is created with a single DenomUnit, with Denom set to "erc20/{erc20}" and Exponent set to 0.

This can be improved in the following way by using two DenomUnits:

1. The smallest possible unit with Exponent = 0, universally called wei (i.e. Denom = "wei") for all such ERC-20 funtokens
2. The regular unit which uses the ERC-20 token's decimals, i.e. { Denom: bankDenom, Exponent: info.Decimals }

This first wei unit will be used as the coin's Base and the second unit as Display.

Additionally, the metadata Name could be set to the retrieved ERC-20 metadata info.Name.

Recommendation:

Consider using two DenomUnits for the new funtoken coin metadata and setting the Name to the ERC-20 token's name. This would bring parity between EVM wallets, such as MetaMask, and Cosmos wallets, such as Keplr/Leap when displaying the coins/tokens.

Originally posted by @berndartmueller in https://github.com/code-423n4/2024-10-nibiru-zenith/pull/21#discussion_r1794845372