Fix/4337 token balances

[borislav-itskov]

Fix:

• for erc-4337 estimations, use the token balances after the simulation from Estimation.sol for fee token payments

Refactor:

• Estimation.sol into smaller chunks

Change:

• return the fee token options from Estimation.sol when we don't have a valid spoof without calculating gasUsed for them. This is for view only accounts - it will allow them to check what fee options they have in the select dropdown