Feat: Update the x/erc20 module’s IBC middleware, callback logic to cover IBC v2 packet

[dongsam]

Update the x/erc20 module’s IBC middleware, callback logic to cover IBC v2 packet

• Context: The ibc_callback/middleware logic in the x/erc20 module converts an IBC-denominated token to an ERC20 token for EVM user convenience upon receipt.
• The current ibc_callbacks logic only handles packets from IBC v1. Thus, logic for handling IBC v2 Packets must be added.
• Additionally, add middleware and routers in the reference example chain’s app.go to match IBC v2. This will serve as a reference for chains needing setup and facilitate E2E test case additions based on the example chain.