chore: Add k6 Loadtest

[markphelps]

Adds some basic loadtests using Grafana k6

This format should be a bit easier to change, add additional tests, and view the results better as we itterate and compare against v2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.58%. Comparing base (ca47763) to head (9beb10e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3860   +/-   ##
=======================================
  Coverage   63.58%   63.58%           
=======================================
  Files         171      171           
  Lines       17380    17380           
=======================================
  Hits        11051    11051           
  Misses       5661     5661           
  Partials      668      668           

Flag	Coverage Δ
unittests	63.58% <ø> (ø)

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