feat: add method to iterate over all registered nano contracts on storage

[pedroferreira1]

Acceptance Criteria

• Add method to iterate through registered nano contracts on storage and in both implemented stores (memory and leveldb).
• Add address to INcData.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.67%. Comparing base (7a11fce) to head (0b52647).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #654       +/-   ##
===========================================
+ Coverage   62.48%   79.67%   +17.19%     
===========================================
  Files          77       77               
  Lines        5838     5846        +8     
  Branches     1214     1214               
===========================================
+ Hits         3648     4658     +1010     
+ Misses       2094     1171      -923     
+ Partials       96       17       -79     

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