feat: EVM Support

[Vvaradinov]

Long standing feature branch for EVM inclusion:

• Instantiated and wired Keepers for x/evm and x/feemarket in app.go
• Additions to config files and proto config
• Included script for starting new testnet directly init.sh
• Separate and included only the needed EthAnteHandler keeping the rest through regular Antehandler stack
• 6 Decimal wrapper for correct displaying and gas logic
• Investigate Coin Type / HD path discrepancies

Guide to run locally

1. Run init.sh in the root of the project - this will start a local node with the testnet command and create a new account in the test keyring with the now supported ethsecp256k1 algorithm called dev0. This is the default dev EthAccount. You will see this in the keyring running babylond keys list --keyring-backend test --home .testnet/node0/babylond

   - address: bbn1q986wh082dp6wndt58j60hrgsr8kh9wgt0maz8
     name: dev0
     pubkey: '{"@type":"/ethermint.crypto.v1.ethsecp256k1.PubKey","key":"A92x5YqLnNhrBrkm5qJ+EhzAPj9qiYF4qjjqh4A/MewT"}'
     type: local
   - address: bbn15qhzl5sncuyq3lvdkw479gttscemlv2c4pmx92
     name: node0
     pubkey: '{"@type":"/cosmos.crypto.secp256k1.PubKey","key":"AyfbMYS6SZHu5+S4dZdDiNIORWHBVh33b0VBBFyVsKYa"}'
     type: local
   

2. Export the PK of the dev0 account using the export command - babylond keys unsafe-export-eth-key dev0 --keyring-backend test --home .testnet/node0/babylond. This will give you your Private Key that you can then import into Metamask.

3. Add new network in Metamask. In the Networks overview at the bottom look for Add Custom Network and use the following information:
   

4. Go to Remix IDE, the default Environment should me Remix VM, change it to Injected Provider and approve the connection from your MM wallet. Now you can deploy any contract and interact with it.