Fix/disallow attach inline datum

[nielstron]

fixes #324

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.50%. Comparing base (efbc2d2) to head (536d1bc).
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
+ Coverage   83.42%   83.50%   +0.08%     
==========================================
  Files          29       29              
  Lines        3705     3699       -6     
  Branches      929      926       -3     
==========================================
- Hits         3091     3089       -2     
+ Misses        448      445       -3     
+ Partials      166      165       -1     

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[cffls]

Looks like an integration test failed due to this change. It turns out the datum from utxo is a datum hash, instead of the actual datum. I think we should allow datum to be attached if its hash was attached to an output. Something like this:

if datum is not None and utxo.output.datum_hash is None and utxo.output.datum is not None: