## Issue Addressed
N/A
## Proposed Changes
Geth's latest release breaks our CI with the following message
```
Fatal: Failed to register the Ethereum service: ethash is only supported as a historical component of already merged networks
Shutting down
```
Latest geth version has removed support for PoW networks. Hence, we need to add an extra `terminalTotalDifficultyPassed ` parameter in the genesis config to start from a merged network.
## Issue Addressed
N/A
## Proposed Changes
Modifies the local testnet scripts to start a network with genesis validators embedded into the genesis state. This allows us to start a local testnet without the need for deploying a deposit contract or depositing validators pre-genesis.
This also enables us to start a local test network at any fork we want without going through fork transitions. Also adds scripts to start multiple geth clients and peer them with each other and peer the geth clients with beacon nodes to start a post merge local testnet.
## Additional info
Adds a new lcli command `mnemonics-validators` that generates validator directories derived from a given mnemonic.
Adds a new `derived-genesis-state` option to the `lcli new-testnet` command to generate a genesis state populated with validators derived from a mnemonic.
