feat: add pr and issue templates

[mrjoelkamp]

summary

• adds PR and Issue templates

Copied from attest-provider with some modifications, they are pretty minimal which is fine for now IMO.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.37%. Comparing base (c7c3d23) to head (f426fa3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #205   +/-   ##
=======================================
  Coverage   66.37%   66.37%           
=======================================
  Files          44       44           
  Lines        3215     3215           
=======================================
  Hits         2134     2134           
  Misses        779      779           
  Partials      302      302           

Flag	Coverage Δ
unittests	66.37% <ø> (ø)

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