feat(contracts): As an Issuer, I want to benefit from an improved NFTPortal

[alainncls]

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What does this PR do?

Adds more features to the NFTPortal

Related ticket

Fixes #714

Type of change

• [ ] Chore
• [ ] Bug fix
• [X] New feature
• [ ] Documentation update

Check list

• [ ] Unit tests for any smart contract change
• [ ] Contracts and functions are documented

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 94.66%. Comparing base (e99f776) to head (5997aac). Report is 28 commits behind head on dev.

Files with missing lines	Patch %	Lines
contracts/src/examples/portals/NFTPortal.sol	0.00%	11 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #715      +/-   ##
==========================================
+ Coverage   92.07%   94.66%   +2.59%     
==========================================
  Files          30       31       +1     
  Lines         492      525      +33     
  Branches      112      123      +11     
==========================================
+ Hits          453      497      +44     
+ Misses         39       28      -11     

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