feat: expose Buffer type needed for codegen

[davidsteiner]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.67%. Comparing base (89af718) to head (0da9512).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/hotfix-message/src/encoding/buffer.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #184      +/-   ##
==========================================
- Coverage   80.71%   80.67%   -0.05%     
==========================================
  Files          66       66              
  Lines        5735     5738       +3     
==========================================
  Hits         4629     4629              
- Misses       1106     1109       +3     

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