Returns an unsigned transaction to withdraw SOL from a stake account

Use cases

a) Withdrawal of the complete account balance and closure of the account

• the stake account needs to be deactivated
• amount equals to the total account balance: amount = account.lamports

b) Withdrawal of only the inactive balance, i.e. Accumulated Jito MV rewards, while keeping the stake account active

• amount equals the withdrawable balance, i.e. amount = account.lamports − effective_stake − rent_exempt_reserve

Please note that the amount always needs to be smaller or equal to the withdrawable amount.