fix(proofs): allow duplicates in proof attributes

[Iskander508]

This is a partial fix for #837
The check is limited to duplicates between predicates and attributes only. Duplicit attributes should be allowed as they don't cause any error during proof creation.
Still todo: Either

• parse and validate based on restrictions, whether the items collide or not
  or
• completely rethink the check and validate only at the point of ProofsModule.acceptRequest (which is the actual problem)

[codecov-commenter]

Codecov Report

Merging #848 (2714a64) into main (8055652) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #848      +/-   ##
==========================================
- Coverage   87.60%   87.59%   -0.01%     
==========================================
  Files         459      458       -1     
  Lines       11179    11176       -3     
  Branches     1897     1897              
==========================================
- Hits         9793     9790       -3     
  Misses       1324     1324              
  Partials       62       62              

Impacted Files	Coverage Δ
packages/core/src/utils/indyProofRequest.ts	100.00% <100.00%> (ø)

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