[evm] Minimalist precompile for x/bank

[Unique-Divine]

Desired Behavior

As a user of an EVM wallet, I should be able to:

• Method IFunToken.sendToBank: Send ERC20 tokens to the bank state as Bank Coins
• Method IFunToken.sendToEvm: Send Bank Coins to the EVM state as ERC20 tokens
• Method IFunToken.bankMsgSend: Make an EVM call that calls "/cosmos.bank.v1beta1.MsgSend" using
  a given to_address, denom, and amount. The to_address can be either a
  bech32 or hexadecimal, similar to precompile for fungible token mappings.
• Method IFunToken.bankBalance: Query the balance of the coin with denomination denom for some address, returning 0 if the account
  does not exist. The `address can be either a bech32 or hexadecimal.
• Method IFunToken.whoAmI: Query the addresses for a Nibiru account. Given some address (either the
  Bech32 or Ethereum hex), return both hexadecimal and bech32 representation. This
  method isn't related to the Bank Module, however it allows future developers to
  easily build on top of the functionality in x/bank and programmatically grab
  nibi-prefixed addresses corresponding to Ethereum address types in other
  smart contracts.

We can add these as methods to FunToken.sol

Related

• [evm] Precompile for one-way EVM calls to invoke/execute Wasm contracts #2048

[Unique-Divine]

The queries have been implemented, but the transfer method has not yet.