Add test vectors from vc-di-eddsa spec.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.93%. Comparing base (c5eeec1) to head (e482a15).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   86.93%   86.93%           
=======================================
  Files           2        2           
  Lines         222      222           
=======================================
  Hits          193      193           
  Misses         29       29           

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