Remove need for desugaring

[mattmook]

Fixes #115

[codecov]

Codecov Report

Attention: Patch coverage is 80.24691% with 16 lines in your changes missing coverage. Please review.

Project coverage is 73.67%. Comparing base (275162a) to head (4ccef06).
Report is 125 commits behind head on main.

Files with missing lines	Patch %	Lines
...ransparency/internal/utils/asn1/GeneralizedTime.kt	0.00%	10 Missing ⚠️
.../certificatetransparency/internal/utils/Rfc3339.kt	93.54%	0 Missing and 2 partials ⚠️
...ertificatetransparency/internal/utils/asn1/ASN1.kt	33.33%	1 Missing and 1 partial ⚠️
...ternal/loglist/deserializer/Rfc3339Deserializer.kt	66.66%	1 Missing ⚠️
...ificatetransparency/internal/utils/asn1/UTCTime.kt	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #117      +/-   ##
============================================
- Coverage     74.07%   73.67%   -0.40%     
+ Complexity      513      512       -1     
============================================
  Files           115      116       +1     
  Lines          1990     2002      +12     
  Branches        289      290       +1     
============================================
+ Hits           1474     1475       +1     
- Misses          397      407      +10     
- Partials        119      120       +1     

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