Better nonce handling

[slundqui]

There's an issue in nonce handling in that calling a trade that e.g., previews the call before submitting can fail itself (e.g., slippage), which ends up updating the internal nonce count before the transaction gets submitted. We solve this by passing in a nonce function instead of the actual nonce, and call this nonce function at the last possible moment (i.e., when sending the built transaction) to ensure nonce bookkeeping isn't incrementing prematurely.

[dpaiton]

clean up the defaults (looks like you actually do want to handle None?) and then it looks good!

[codecov]

Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.48%. Comparing base (a7f0e94) to head (b5e6c0c).

Files	Patch %	Lines
src/agent0/ethpy/base/transactions.py	86.66%	2 Missing ⚠️
...e/hyperdrive/interactive/local_hyperdrive_agent.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1609      +/-   ##
==========================================
+ Coverage   81.15%   81.48%   +0.33%     
==========================================
  Files          98       98              
  Lines        7295     7248      -47     
==========================================
- Hits         5920     5906      -14     
+ Misses       1375     1342      -33     

Flag	Coverage Δ
unittests	81.48% <85.00%> (+0.33%)	⬆️

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