repo: mandatory issue templates (AIDM-427)

[tlhunter]

Description

• makes using issue templates mandatory
• adds a security document
• standardizes the issue creation experience across all tracers
• see the node.js create issue screen for an example of what this looks like

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.78%. Comparing base (6b3218e) to head (b8d19d9).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3003      +/-   ##
============================================
- Coverage     74.80%   74.78%   -0.02%     
  Complexity     2784     2784              
============================================
  Files           112      112              
  Lines         11020    11020              
============================================
- Hits           8243     8241       -2     
- Misses         2777     2779       +2     

Flag	Coverage Δ
tracer-php	74.78% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes

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[PROFeNoM]

LGTM

[bwoebi]

This is okay.