Enable user to specify keystores dir with --withValidatorKeystore

[g11tech]

BREAKING CHANGE: use --network sepolia instead of --devnetVars ./sepolia.vars

now to use --withValidatorKeystore a user has to provide a dir (absolute path) having keystores folder and pass.txt to import to spinup the validator

This enables users:

• Keep their keystores and pass at their custom folders
• spin up multiple validators with their own keystores and password file

[g11tech]

@philknows could you may be test it out and see if it works for you, have done some testing here

[philknows]

Updated guide here: https://hackmd.io/d2AhOTcNRYm5wcTWc0Vw6A Will give it a thorough run tomorrow after things have re-synced again testing a couple validator sets. Will then approve and merge!

[g11tech]

Updated guide here: https://hackmd.io/d2AhOTcNRYm5wcTWc0Vw6A Will give it a thorough run tomorrow after things have re-synced again testing a couple validator sets. Will then approve and merge!

reviewed looks good :+1: , also you can add --justMevBoost in the quickstart options table to start only mev boost for that network