dev: stricter types for MessageCallOuput

[obatirou]

What was wrong?

Logs, error and touched_accounts can have stricter types

Related to Issue #1097

How was it fixed?

Stricter types

• logs: Union[Tuple[()], Tuple[Log, ...] to Tuple[Log, ...] (redundant)
• errors: Option[Exception] to Option[EthereumException]
• touched_accounts: Iterable type to Set

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.90%. Comparing base (da1e112) to head (0b2b825).
Report is 76 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1098      +/-   ##
==========================================
+ Coverage   83.59%   84.90%   +1.30%     
==========================================
  Files         644      649       +5     
  Lines       36123    36078      -45     
==========================================
+ Hits        30198    30633     +435     
+ Misses       5925     5445     -480     

Flag	Coverage Δ
unittests	84.90% <100.00%> (+1.30%)	⬆️

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