Issue 155: log metadata prior to verification (PR #160 fixes)

[rgaudin]

I can't push on #160 so here's a copy of it with my fixes at the end.
Should it be satisfactory, I suggest we squash all commits into one.

Fixes #155

[benoit74]

I feel like it is indeed way simpler to read for maintainers. Less open to later modifications, but as already said this would be premature optimization from my PoV.

I just have one small question about one log message from not decodable metadata, I feel like we should be more explicit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ada7f73) to head (def563a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #172   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        32           
  Lines         1412      1439   +27     
  Branches       243       248    +5     
=========================================
+ Hits          1412      1439   +27     

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[benoit74]

LGTM, I just squashed the commits and edited the commit message. Commit is still attributed to @richterdavid which is ok.