Local devnet

[dknopik]

We want to be able to run a local devnet.

• implement custom test network directories (via --testnet-dir) for ETH network parameters and SSV parameters such as contract address.
• implement --no-sync flag to support running off a manually created database. This would allow us running on networks that do not have all the SSV contracts deployed.
• extend Kurtosis to utilize the above to create a nice devnet
  • alternatively, look into integrating anchor into ssv's devnet scripts