Add more basic VCDM validation checks for input to /issue.

[dlongley]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.53%. Comparing base (7336b04) to head (cccaa25).

Additional details and impacted files

@@               Coverage Diff                @@
##           vc-v2-latest     #168      +/-   ##
================================================
+ Coverage         90.23%   90.53%   +0.30%     
================================================
  Files                17       17              
  Lines              3071     3170      +99     
================================================
+ Hits               2771     2870      +99     
  Misses              300      300              

Files	Coverage Δ
schemas/bedrock-vc-issuer.js	100.00% <100.00%> (ø)

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