feat: add thin representation to Hip*

[polazarus]

closing #45

[codecov]

Codecov Report

❌ Patch coverage is 76.10147% with 179 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.26%. Comparing base (1308a5d) to head (1238367).

Files with missing lines	Patch %	Lines
src/vecs/smart.rs	60.47%	132 Missing ⚠️
src/bytes/raw/allocated.rs	87.70%	22 Missing ⚠️
src/common/traits.rs	42.85%	12 Missing ⚠️
src/common.rs	71.42%	6 Missing ⚠️
src/smart.rs	93.82%	5 Missing ⚠️
src/bytes/raw.rs	92.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   99.78%   96.26%   -3.53%     
==========================================
  Files          34       35       +1     
  Lines        5023     5215     +192     
  Branches     5023     5215     +192     
==========================================
+ Hits         5012     5020       +8     
- Misses          5      189     +184     
  Partials        6        6              

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