epic(evm): fungible tokens: Coin to ERC20 and ERC20 to Coin

[Unique-Divine]

Objective

Extend the x/evm module to enable the creation of coins (native fungible tokens) from ERC20 contract tokens on the Nibiru EVM, and to create ERC20 tokens from coins.

Specification

Specification Backlink (Notion)

Tickets

See User Stories (Spec)

• [x] #1882
• [x] #1944
• [x] #1943
• [x] #1942: Functionality to create the FunToken mapping for a bank coin, producing a corresponding ERC20 contract.
• [x] #1941: Functionality to create the FunToken mapping for an ERC20 token contract, producing a bank coin by storing its metadata in state.
• [x] #1940
• [ ] [WIP] Describe and create tickets for frontend UI/UX changes to fit into sprints. For example, MetaMask setup

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This ticket is part of #1836

[Unique-Divine]

Update: Assigned "homework" to the group to deliberate on designs and draft and initial proposal. cc @onikonychev @k-yang

[cgilbe27]

https://github.com/NibiruChain/web-app/issues/1077