Allow credential templates to return entire credential requests.

[dlongley]

This PR also includes test dependencies that include updated VC-2.0 modules. We don't plan on merging this to main until those modules (with those features) are released.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.05540% with 72 lines in your changes are missing coverage. Please review.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #59   +/-   ##
=======================================
  Coverage        ?   85.95%           
=======================================
  Files           ?       11           
  Lines           ?     2605           
  Branches        ?        0           
=======================================
  Hits            ?     2239           
  Misses          ?      366           
  Partials        ?        0           

Files	Coverage Δ
lib/exchanges.js	75.64% <100.00%> (ø)
lib/http.js	90.64% <100.00%> (ø)
lib/issue.js	94.91% <83.33%> (ø)
lib/index.js	84.61% <80.76%> (ø)
lib/openId.js	86.70% <82.45%> (ø)
lib/vcapi.js	76.04% <76.04%> (ø)

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