[slashing] Withdrawal support in CLI

[jbrower95]

New Commands

• ./cli queue-withdrawal --sender <pk> [--amountWei <amount>] --podAddress <pod> --execNode $NODE_ETH --beaconNode $NODE_BEACON [--gas | -g]
  usage: Queues a full withdrawal of any shares you may have in the native ETH strategy. Optionally estimate gas with -g. If amountWei is set, the withdrawal will be at-most amountWei in size.
• ./cli complete-all-withdrawals --sender <pk> --podAddress <pod> --execNode $NODE_ETH --beaconNode $NODE_BEACON
  usage: Completes all withdrawals for any shares you may have in the native ETH strategy. Optionally estimate gas with -g.
• ./cli show-withdrawals --podAddress <pod> --execNode $NODE_ETH --beaconNode $NODE_BEACON
  usage: Lists all withdrawals associated with the pod's owner. (regardless of strategy).

Test Plan:

• ✅ Queue a withdrawal on preprod (Transaction)
• View the withdrawal in the CLI
• ✅ Complete the withdrawal (Transaction)