Fix reading ASN.1 length field plus more robust tests

[mattmook]

Fixes #80 and #83

[codecov[bot]]

Codecov Report

Merging #84 (c2c8063) into main (f167a3d) will increase coverage by 4.33%. The diff coverage is 83.27%.

@@             Coverage Diff              @@
##               main      #84      +/-   ##
============================================
+ Coverage     71.26%   75.59%   +4.33%     
- Complexity      392      485      +93     
============================================
  Files           110      116       +6     
  Lines          1855     2004     +149     
  Branches        263      313      +50     
============================================
+ Hits           1322     1515     +193     
+ Misses          408      351      -57     
- Partials        125      138      +13     

Impacted Files	Coverage Δ
...etransparency/internal/utils/X509CertificateExt.kt	100.00% <ø> (ø)
...catetransparency/internal/utils/asn1/ASN1Logger.kt	0.00% <0.00%> (ø)
...rency/internal/utils/asn1/ASN1PrintableStringUS.kt	0.00% <0.00%> (ø)
...nternal/utils/asn1/x509/CertificateSerialNumber.kt	75.00% <50.00%> (+3.57%)	:arrow_up:
...etransparency/internal/utils/asn1/x509/Validity.kt	92.85% <50.00%> (+46.70%)	:arrow_up:
...ernal/utils/asn1/header/ASN1HeaderTagExtensions.kt	56.81% <56.81%> (ø)
...al/utils/asn1/header/ASN1HeaderLengthExtensions.kt	75.00% <75.00%> (ø)
...parency/internal/utils/asn1/x509/TbsCertificate.kt	68.75% <76.47%> (+5.59%)	:arrow_up:
...arency/internal/utils/asn1/header/ASN1HeaderTag.kt	89.18% <89.18%> (ø)
...atetransparency/internal/utils/asn1/ASN1Integer.kt	92.85% <90.90%> (+21.42%)	:arrow_up:
... and 17 more

... and 4 files with indirect coverage changes

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