Update the rtx_timer to RFC 9260

[philipch07]

Description

• Updates the rtx_timer to RFC 9260.
• Fixes typos
• Adds unit tests + fuzz tests (Add fuzz testing #124)

Reference issue

A part of #402.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.87%. Comparing base (f37b783) to head (0c980d9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage   81.77%   81.87%   +0.10%     
==========================================
  Files          51       51              
  Lines        4522     4547      +25     
==========================================
+ Hits         3698     3723      +25     
  Misses        680      680              
  Partials      144      144              

Flag	Coverage Δ
go	81.87% <100.00%> (+0.10%)	⬆️
wasm	67.01% <100.00%> (-0.88%)	⬇️

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