feat: replacing usages of unwrap() with expect or Result (#70)

[holtgrewe]

The remaining places are OK

$ rg -w unwrap
src/parser/ds.rs
32:    pub fn unwrap(self) -> T {
965:        assert_eq!(Mu::Certain(1).unwrap(), 1);
966:        assert_eq!(Mu::Uncertain(1).unwrap(), 1);

[codecov]

Codecov Report

Patch coverage: 88.34% and project coverage change: -0.08 ⚠️

Comparison is base (a44e28c) 88.31% compared to head (f9c6732) 88.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   88.31%   88.23%   -0.08%     
==========================================
  Files          19       19              
  Lines        7470     7516      +46     
==========================================
+ Hits         6597     6632      +35     
- Misses        873      884      +11     

Impacted Files	Coverage Δ
src/data/uta_sr.rs	53.01% <ø> (ø)
src/normalizer.rs	70.76% <52.38%> (-0.67%)	⬇️
src/mapper/assembly.rs	80.34% <71.42%> (ø)
src/data/uta.rs	91.54% <83.33%> (-0.16%)	⬇️
src/mapper/alignment.rs	91.78% <87.80%> (+0.01%)	⬆️
src/data/cdot/json.rs	93.69% <100.00%> (+0.01%)	⬆️
src/mapper/altseq.rs	95.08% <100.00%> (+0.12%)	⬆️
src/mapper/cigar.rs	96.53% <100.00%> (+0.09%)	⬆️
src/mapper/variant.rs	90.81% <100.00%> (+0.01%)	⬆️
src/parser/impl_parse.rs	99.69% <100.00%> (+<0.01%)	⬆️
... and 3 more

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