add name property to field definition

[mistermoe]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  adds name property to field definition in pd v2 json schema

• What is the current behavior? (You can also link to an open issue here)
  using evaluatePresentation method fails when presentation definition includes a field object with the name property in it

• What is the new behavior (if this is a feature change)?

• Other information:

Reference from the PEX V2 spec

[mistermoe]

Related: Sphereon-Opensource/pex-openapi#28

[nklomp]

LGTM. Thanks

[codecov-commenter]

Codecov Report

Merging #123 (e35b355) into develop (32e30c9) will decrease coverage by 0.21%.
The diff coverage is n/a.

❗ Current head e35b355 differs from pull request most recent head 6044810. Consider uploading reports for the commit 6044810 to get more accurate results

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@@             Coverage Diff             @@
##           develop     #123      +/-   ##
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- Coverage    95.91%   95.70%   -0.21%     
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  Files           63       63              
  Lines         2203     2213      +10     
  Branches       411      473      +62     
===========================================
+ Hits          2113     2118       +5     
- Misses          90       92       +2     
- Partials         0        3       +3     

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