feat: Add "no proof check" option for VC decoding

[kdimak]

closes #1002

Signed-off-by: Dima [email protected]

The main goal of this feature is to provide an option to disable JWS proof checks (i.e. JWT signature check) for VC Test Suite.
This is done on purpose as the Suite is focused on testing the VC data model and it does not suppose to test the cryptographic proofs (see w3c/vc-test-suite#101).
It turned out that JWS test input file containing VC from VC Test Suite has invalid data model (w3c/vc-test-suite#103) and thus the patch of that file (https://github.com/hyperledger/aries-framework-go/blob/1674d601e90b7b86e8d9b0ef56e7981517ccf993/scripts/run_vc_test_suite.sh#L42) is still present.

[codecov]

Codecov Report

Merging #1012 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1012   +/-   ##
=======================================
  Coverage   90.88%   90.88%           
=======================================
  Files          93       93           
  Lines        5856     5856           
=======================================
  Hits         5322     5322           
  Misses        290      290           
  Partials      244      244

Impacted Files	Coverage Δ
pkg/doc/verifiable/presentation_jws.go	100% <100%> (ø)	⬆️
pkg/doc/verifiable/credential_jws.go	100% <100%> (ø)	⬆️
pkg/doc/verifiable/presentation.go	89.39% <100%> (-0.16%)	⬇️
pkg/doc/verifiable/credential.go	92.97% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1674d60...24ae483. Read the comment docs.