Allow specifying origin parameter for withdrawals

[nlordell]

This PR adds an --origin flag (the name was chosen to be analogous to the existing --origin flags in both the dump and withdrawService tasks).

This flag allows the caller of hardhat withdraw to specify the solver address to use for executing the withdrawal transaction from the settlement contract. Additionally, this PR also makes it possible to call the withdraw task for an --origin for which you do not have a private key. This is important to be able to build withdrawal transactions that can be sent by a Multisig solver for example.

Test Plan

Run the withdraw task for a short list of tokens so it completes quickly:

% npx hardhat withdraw \
  --network mainnet \
  --origin 0xA03be496e67Ec29bC62F01a428683D7F9c204930 \
  --receiver 0x84E5c8518c248DE590D5302fD7C32d2Ae6B0123c \
  --min-value 500 \
  0x1a5f9352af8af974bfc03399e3767df6370d82e4 0x6810e776880c02933d47db1b9fc05908e5386b96

Using account 0xA03be496e67Ec29bC62F01a428683D7F9c204930
Ignored 165.688615512331530757 units of OWL (0x1a5f9352af8af974bfc03399e3767df6370d82e4) with value 72.02 USD, does not satisfy conditions on min value and leftover
Amounts to withdraw:
 address                                    | balance (usd) | balance                | withdrawn amount       | symbol 
--------------------------------------------+---------------+------------------------+------------------------+--------
 0x6810e776880c02933d47db1b9fc05908e5386b96 |      85138.94 | 244.830313904447664152 | 244.830313904447664152 | GNO    

The transaction will cost approximately 0.00212176304385864 ETH (6.65 USD) and will withdraw the balance of 1 tokens for an estimated total value of 85138.94 USD. All withdrawn funds will be sent to 0x84E5c8518c248DE590D5302fD7C32d2Ae6B0123c.
Settlement transaction:
to:   0x9008D19f58AAbD9eD0D60971565AA8510560ab41
data: 0x13d79a0b000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000001a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000200000000000000000000000006810e776880c02933d47db1b9fc05908e5386b96000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000044a9059cbb00000000000000000000000084e5c8518c248de590d5302fd7c32d2ae6b0123c00000000000000000000000000000000000000000000000d45b4015459fbb018000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

[josojo]

Nice. Thanks for coming up so quickly with it

[fedgiac]

Looks good!