feat: leb128 unsigned utilities

[r4mmer]

Acceptance Criteria

• Add unsigned leb128 encoding to the leb128 util

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

Attention: Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.89%. Comparing base (110fa5b) to head (f24439f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/utils/leb128.ts	82.60%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #859   +/-   ##
=======================================
  Coverage   82.88%   82.89%           
=======================================
  Files          90       90           
  Lines        6937     6955   +18     
  Branches     1469     1476    +7     
=======================================
+ Hits         5750     5765   +15     
- Misses       1174     1177    +3     
  Partials       13       13           

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