Ethpy transaction hotfixes

[slundqui]

1. Adding in custom non-async wait for transaction function that implements exponential backoff.
2. Transactions sometimes don't return logs (e.g., the checkpoint call), so don't throw an error when no logs are found.
3. Redeem withdrawal shares with an invalid amount is a valid contract call, so we explicitly check for zero values in the preview call on our side and throw an error if we detect this case
4. Adding test that goes through invalid trades

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
elf-simulations	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 9, 2023 10:50pm