Always return ParseResult from biip.parse()

[jodal]

This makes it a bit easier to use biip.parse() as you will no longer need to catch ParseError to handle all cases.

This isn't a breaking change unless you relied on parse() to raise when no parsing attempt succeeds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (42f3fc1) to head (be91bd5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #376   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         1082      1075    -7     
  Branches       107       106    -1     
=========================================
- Hits          1082      1075    -7     

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