misc: Add GH issue template

[compor]

This PR adds:

• A GH issue/bug template

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.23%. Comparing base (9e4c872) to head (812eb0c).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3796      +/-   ##
==========================================
- Coverage   91.23%   91.23%   -0.01%     
==========================================
  Files         461      461              
  Lines       57445    57487      +42     
  Branches     5546     5548       +2     
==========================================
+ Hits        52411    52449      +38     
- Misses       3612     3615       +3     
- Partials     1422     1423       +1     

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[alexarice]

Would it be worth saying something about tagging people who you think might be relevant?

[compor]

Would it be worth saying something about tagging people who you think might be relevant?

My impression was that we would "comb over" the issues frequently and do this if we know who to tag - not sure if an external reporter would know who works (or can work) on what.